index.css

/* Image Slideshow Container */
*{box-sizing: border-box;}

body,html {
    font-family: 'Open Sans Condensed', Helvetica, Calibri;
    margin: 0;
    height: 100%;
}

.mySlides {
    height: 100%;
    width: 100%;
    display: none;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.slideshow-container {
    /*
    width: 1585px;
    height: 790px;*/
    width: 100vw;
    height: 100vh;
    position: relative;
    margin: 0;
    z-index: 0;
}

.mySlides img {
    width: 100%;
    height: 100%;
}

.text {
    color: white;
    font-size: 30px;
    padding: 8px 30px;
    position: absolute;
    top: 35%;
    text-align: center;
    width: 100%;
    z-index: 2;
    background-color: rgba(27,27,27,0.7);
    color: #fff;
}

.dot {
    height: 14px;
    width: 14px;
    margin: 0 30px;
    background-color: transparent;
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.6s ease;
    position: relative;
    bottom: 100px;
    z-index: 2;
    border: 2px solid #fff;
}

.active {
    /*background-color: #fff;*/
    background-color: rgba(27,27,27,0.7);
    z-index: 2;
}

.scroll_down {
    padding: 3px 15px;
    border: 2px solid #fff;
    bottom: 75px;
    text-align: center;
    z-index: 2;
    position: relative;
    color: white;
    border-radius: 20px;
    width: auto;
    cursor: pointer;
    background-color: transparent;
}

.scroll_down:hover {
    background-color: rgba(27,27,27,0.7);
}

.scroll_down a {
    text-decoration: none;
    color: #fff;
}

.scroll_down a:hover {
    text-decoration: none;
    color: #fff;
}

.fade {
    -webkit-animation-name: fade;
    -webkit-animation-duration: 1.5s;
    animation-name: fade;
    animation-duration: 1.5s;
}

@-webkit-keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

@keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}
/* Image Slideshow Container */

/* Containers */
.service-container, .project-container, 
.team-container, .assestment-container, .contact-container, .footer {
   /* width: 1585px;
    height: 790px;*/
    width: 100vw;
    height: 100vh;
    position: relative;
    margin: 0;
    z-index: 0;
    border: 2px solid black;
    background-color: #d9d9d9;
}

.description-container {
    width: 100vw;
    height: 100vh;
    margin-bottom: 100px;
    position: relative;
    margin: 0;
    z-index: 0;
}

.description-container img, .service-container img {
    width: 100%;
    height: 100%;
    z-index: 1;
    position: absolute;
}

.scroll_down1, .scroll_down2, .scroll_down3, .scroll_down4, .scroll_down5, .scroll_down6, .scroll_up, .scroll_downd {
    padding: 3px 15px;
    border: 2px solid #fff;
    top: 645px;
    text-align: center;
    z-index: 2;
    position: relative;
    color: white;
    border-radius: 20px;
    width: auto;
    cursor: pointer;
    background-color: transparent;
}

.scroll_downd {
    top: 92vh;
}

.scroll_down1:hover,.scroll_down2:hover,.scroll_down3:hover,.scroll_down4:hover,.scroll_down5:hover,
.scroll_down6:hover, .scroll_up:hover, .scroll_downd:hover {
    background-color: rgba(27,27,27,0.7);
}

.scroll_down1 a, .scroll_down2 a, .scroll_down3 a, .scroll_down4 a, .scroll_down5 a, .scroll_down6 a, .scroll_up a, .scroll_downd a {
    text-decoration: none;
    color: #fff;
}

.scroll_down1 a:hover,.scroll_down2 a:hover,.scroll_down3 a:hover,.scroll_down4 a:hover,.scroll_down5 a:hover,
.scroll_down6 a:hover, .scroll_up a:hover, .scroll_downd a:hover { 
    text-decoration: none;
    color: #fff;
}
/* Containers */

/*Dynamic Header */
.ha-header {
    color: #000;
    position: fixed;
    top: 0px;
    left: 0;
    width: 100%;
    height: 50px;
    z-index: 50;
    background-color: rgba(27,27,27,0.7);
    color: white;
    -webkit-transform: translateY(-100%);
    -moz-transform: translateY(-100%);
    transform: translateY(-100%);
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    transition: all 0.5s;
    box-shadow: 2px 1px 1px #000;
    text-transform: uppercase;
}

.ha-header h1,
.ha-header h1::before,
.ha-header h1 span,
.ha-header nav,
.ha-header nav::before {
    display: inline-block;
    vertical-align: middle;
    float: left;
}

.ha-header h1 {
    font-size: 27px;
    font-weight: bold;
    margin: 0;
    padding: 5px;
    padding-left: 40px;
    cursor: default;
    height: 100%;
    z-index: 1;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    transition: all 0.5s;
    text-decoration: none;
    color: white;
}

.ha-header h1 span a {
    text-decoration: none;
    color: #fff;
}

.ha-header h1::before,
.ha-header nav::before {
    height: 100%;
}

.ha-header h1::after {
    width: 100px;
    height: 50px;
    position: absolute;
    z-index: 100;
    top: 0;
    left: 0;
    cursor: pointer;
    -webkit-transition: opacity 0.5s;
	-moz-transition: opacity 0.5s;
	transition: opacity 0.5s;
}

.ha-header nav {
    height: 100%;
    float: right;
}

.ha-header nav a {
    color: #fff;
    width: 130px;
    display: inline-block;
    padding: 10px;
    font-size: 20px;
    cursor: pointer;
    outline: none;
    text-decoration: none;
    text-align: center;
}

.ha-header nav a:hover {
    border-bottom: solid 2px #fff;
}


/* Individual States: */

.ha-header-hide {
    height: 50px;
    -webkit-transform: translateY(-100%);
    -moz-transform: translateY(-100%);
    transform: translateY(-100%);
}

.ha-header-show {
    height: 50px;
    -webkit-transform: translateY(0%);
    -moz-transform: translateY(0%);
    transform: translateY(0%);
}

.ha-header-small {
    height: 50px;
}
/* Individual States */

/* Button of switch language */
.language {
    float: right;
    overflow: hidden;
    display: inline-block;
}

.language .btn_language {
    cursor: pointer;
    font-size: 20px;
    border: none;
    outline: none;
    color: white;
    padding: 10px;
    background-color: inherit;
    width: 130px;
}

.language-content {
    display: none;
    position: absolute;
    background-color: rgba(27,27,27,0.7);
    max-width: 130px;
    z-index: 100;
    border: none;
    top: 55px;
}

.language-content a {
    float: none;
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: center;
    border: none;
}

.ha-header nav .language .language-content a:hover {
    background-color: rgba(250,250,250,0.7);
    color: #000;
    border-bottom: solid 0px;
}

.show {
    display: block;
}

#poland {
    float: left;
    vertical-align: middle;
}

#uk {
    vertical-align: middle;
    float: left;
}

/* Social Media Buttons in right sidebar */
.social-media-icons {
    right: 10px;
    top: 20%;
    position: fixed;
    float: right;
    z-index: 50;
    -webkit-transform: translateX(130%);
    -moz-transform: translateX(130%);
    transform: translateX(130%);
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    transition: all 0.5s;
}

.social-media-icons img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin: 5px;
}

.social-media-icons img:hover {
    border: solid 2px #fff;
}

.social-media-icons ul {
    list-style: none;
}

.social-media-icons a {
    display: block;
    line-height: 0;
}

.social-media-icons .up_button {
    width: 50px;
    height: 50px;
    background-color: rgba(25,25,25,0.7);
    border-radius: 50%;
    margin: 5px;
    font-size: 20px;
    font-weight: bolder;
    text-align: center;
    padding: 7px;
    cursor: pointer;
    color: #fff;
}

.social-media-icons .up_button .scrollup {
    padding-top: 14px;
    color: #fff;
}

.social-media-icons .up_button:hover {
    border: solid 2px #fff;
}

.social-hide {
    -webkit-transform: translateX(130%);
    -moz-transform: translateX(130%);
    transform: translateX(130%);
    width: 100px;
}

.social-show {
    -webkit-transform: translateX(0%);
    -moz-transform: translateX(0%);
    transform: translateX(0%);
    width: 100px;
}

/* Description Container */
.logos {
    z-index: 30;
    text-align: center;
    vertical-align: middle;
    position: absolute;
    font-size: 7em;
    font-stretch: ultra-condensed;
    color: white;
    margin-top: 35vh;
    margin-left: 10vw;
    cursor: pointer;
    border-top: solid 5px #fff;
    width: 80vw;
    height: 30vh;
    background-color: rgba(2,2,2,0.4);
    transition: .5s ease;
   padding-top: 2%;
}

.logos:hover {
    border-top: solid 10px #fff;
    border-bottom: solid 10px #fff;
}

.overlay {
    position: absolute;
    bottom: 100%;
    left: 0;
    right: 0;
    background-color: rgba(2,2,2,0.7);
    border-bottom: solid 2px #fff;
    overflow: hidden;
    width: 100%;
    height: 0;
    transition: .5s ease
}

.logos:hover .overlay {
    bottom: 0;
    height: 100%
}

.overlay-text {
    color: #fff;
    font-size: 25px;
    position: absolute;
    overflow: hidden;
    top: 50%;
    left: 50%;
    width: 100%;
    padding: 0 20px;
    transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
}

/* Service-menu */
.service-section {
    margin-top: 15vh;
    margin-bottom: 15vh;
    margin-left: 10vw;
    margin-right: 10vw;
    z-index: 30;
    height: 70vh;
    width: 80vw;
    position: relative;
}

.service-menu {
    width: 100%;
    height: 94%;
    z-index: 30;
    background-color: rgba(2,2,2,0.4);
    text-align: center;
    position: relative;
    display: table;
}

.row {
    z-index: 31;
    height: 50%;
    display: table-row;
}

.row-click {
    text-transform: uppercase;
    text-align: center;
    font-size: 15px;
    color: #fff;
    background-color: rgba(2,2,2,0.6);
    height: 6%;
    z-index: 100;
    position: relative;
}

.row-text {
    padding-top: 0.5%;
}

.cell {
    z-index: 32;
    width: 25%;
    display: table-cell;
    cursor: pointer;
    transition: .7s ease;
}

#cell1:hover, #cell2:hover, #cell3:hover, #cell4:hover, #cell5:hover, #cell6:hover, #cell7:hover, #cell8:hover {
    background-color: rgba(2,2,2,0.6);
    transition: .7s ease;
    border-bottom: solid 5px #fff;
    z-index: 100;
}

#cell1, #cell2, #cell3, #cell4 {
    border-bottom: solid 0.5px rgba(255,255,255,0.5);
}

.cell img {
    margin-top: 15%;
    margin-left: 25%;
    width: 50%;
    height: 50%;
    text-align: center;
    float: left;
    position: relative;
    color: #fff;
}

.cell-text {
    text-transform: uppercase;
    text-align: center;
    font-size: 15px;
    /*color: rgba(255,255,255,0.8);*/
    color: #fff;
    padding-top: 60%;
}

/* Containers with apperance overlay-panel */

.overlay-panel, .overlay-panel2, .overlay-panel3, .overlay-panel4, .overlay-panel5, .overlay-panel6, .overlay-panel7, .overlay-panel8 {
    height: 100%;
    width: 50vw;
    position: fixed;
    z-index: 100;
    right: -50vw;
    top: 0;
    background-color: rgba(2,2,2,0.8);
    overflow-x: hidden;
    transition: .5s ease;
    color: #fff;
}

.overlay-panel ul, .overlay-panel2 ul, .overlay-panel3 ul, .overlay-panel4 ul, .overlay-panel5 ul, .overlay-panel6 ul, .overlay-panel7 ul, .overlay-panel8 ul {
    list-style: none;
    padding: 0;
    margin-bottom: 4%;
    margin-left: 20%;
    margin-right: 20%;
}

.overlay-panel li, .overlay-panel2 li, .overlay-panel3 li, .overlay-panel4 li, .overlay-panel5 li, .overlay-panel6 li, .overlay-panel7 li, .overlay-panel8 li {
    border-bottom: solid 0.1px rgba(255,255,255,0.7);
    line-height: 45px;
    padding-bottom: 3px;
    padding-top: 3px;
    text-align: left;
    width: 100%;
}

.panel-switch, .panel-switch2, .panel-switch3, .panel-switch4, .panel-switch5, .panel-switch6, .panel-switch7, .panel-switch8 {
    right: 0;
}

.overlay-panel-content, .overlay-panel-content2, .overlay-panel-content3, .overlay-panel-content4, .overlay-panel-content5, .overlay-panel-content6, .overlay-panel-content7, .overlay-panel-content8 {
    position: relative;
    margin-top: 10%;
    width: 100%;
    text-align: center;
    font-size: 18px;
    margin-bottom: 4%;
}

.mynav-button, .mynav-button2, .mynav-button3, .mynav-button4, .mynav-button5, .mynav-button6, .mynav-button7, .mynav-button8 {
    margin: 20px 0;
    padding: 3px 15px;
    border: 2px solid #fff;
    text-align: center;
    color: #fff;
    border-radius: 20px;
    width: auto;
    cursor: pointer;
    background-color: transparent;
    transition: .5s ease;
}

.mynav-button:hover, .mynav-button2:hover, .mynav-button3:hover, .mynav-button4:hover, .mynav-button5:hover, .mynav-button6:hover, .mynav-button7:hover, .mynav-button8:hover {
    /*background-color: rgba(27,27,27,0.7);*/
    background-color: #fff;
    color: #000;
    transition: .5s ease;
    font-weight: bold;
}

.nav-description, .nav-description2, .nav-description3, .nav-description4, .nav-description5, .nav-description6, .nav-description7, .nav-description8 {
    padding: 0 20%;
}

.overlay-panel .closebtn , .overlay-panel2 .closebtn2, .overlay-panel3 .closebtn3 , .overlay-panel4 .closebtn4, .overlay-panel5 .closebtn5 , .overlay-panel6 .closebtn6, .overlay-panel7 .closebtn7 , .overlay-panel8 .closebtn8{
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 35px;
    color: #fff;
    transition: .5s ease;
}

.closebtn:hover, .closebtn2:hover, .closebtn3:hover, .closebtn4:hover, .closebtn5:hover, .closebtn6:hover, .closebtn7:hover, .closebtn8:hover {
    color: silver;
    transition: .5s ease;
}


@media screen and (max-height: 450px) {
    .overlay .closebtn {
        font-size: 25px;
        top: 15px;
        right: 35px;
    }
}