header.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

/* hamburger menu */

#hamburger-nav{
    display: none;
}
.hamburger-nav{
    position: relative;
    display: inline-block;
}

.hamburger-menu{
    position: relative;
    display: inline-block;
}
.hamburger-icon{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height:    24px;
    width: 30px;
    cursor: pointer;
}

.hamburger-icon span{
    width: 100%;
    height: 2px;
    background-color: black;
    transition: all 0.3 ease-in-out ;
}

.menu-links{
    position: absolute;
    top: 100%;
    right: 0;
    background-color:transparent;
    width: fit-content;
    z-index: 1;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3 ease-in-out;

}

.menu-links a{
    display: block;
    padding: 10px;
    text-align: center;
    font-size: 1.5rem;
    color: black;
    text-decoration: none;
    transition: all 0.3 ease-in-out;
}

.menu-links li{
    list-style: none;
}

.menu-links.open{
    max-height:300px ;
}

.hamburger-icon.open span:first-child{
    transform: rotate(45deg) translate(10px,5px);
}

.hamburger-icon.open span:nth-child(2){
    opacity: 0;
}


.hamburger-icon.open span:last-child{
    transform: rotate(-45deg) translate(10px,-5px);
}

.hamburger-icon span:first-child{
    transform: none;
}


.hamburger-icon span:nth-child(2){
    opacity: 1;
}
.hamburger-icon span:last-child{
    transform: none;
}

.portfolio-menu{
	text-align:center;
}
.portfolio-menu ul li{
	display:inline-block;
	margin:0;
	list-style:none;
	padding:10px 15px;
	cursor:pointer;
	-webkit-transition:all 05s ease;
	-moz-transition:all 05s ease;
	-ms-transition:all 05s ease;
	-o-transition:all 05s ease;
	transition:all .5s ease;
}

.portfolio-item{
	/*width:100%;*/
}
.portfolio-item .item{
	/*width:303px;*/
	float:left;
	margin-bottom:10px;
}