style.css

body {
    padding: 0;
    margin: 0;
    overflow-x: hidden;
}

.dark-mode {
    background-color: #202040 !important;
    color: azure !important;
}

.header {
    margin-top: 5vh;
    border: 5px solid skyblue;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.margin-right-auto {
  margin-right: auto;
}

.date {
    margin-left: auto;
    margin-right: 1vw;
    display: flex;
    flex-direction: column;
    text-align: center;
}

h1 {
    text-align: center;
    font-size: 3em;
}

#todo-form {
    padding: 5vh 0;
}

.col-done-width {
    width: 4vw;
    text-align: center;
}

.col-done-width div {
    margin-top: 3px;
}

.fa-sort, .fa-sort-up, .fa-sort-down {
    padding-left: 5px;
}

.col-prio-width {
    width: 10vw;
    text-align: center;
    cursor: pointer;
}

th.col-task {
    text-align: center;
    cursor: pointer;
}

th.col-mat-width {
    width: 10vw;
    text-align: center;
}

.completed-todo {
    text-decoration: line-through;
}

.alert-box {
    position: absolute;
    top: 6vh;
    right: 10vw;
    padding: 1vw;
    background-color: aliceblue;
    border: 2px solid grey;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    border-radius: 5px;
    transition: transform 0.3s ease-in-out;
}

.alert-box-disappear {
    transform: translateX(500%);
}

.fa-check-circle {
    padding-right: 10px;
    color: green;
}

.form-row-flex {
    margin: 0.5em 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#urgent, #important {
    margin-right: 0.5em;
}

.submit-button-div {
    padding-right: 0 !important;
    padding-left: 25px !important;
}

.input-group {
    width: 50% !important;
}

.matrix {
    height: 45vh;
    margin-bottom: 1%;
    transition: all 1s ease;
}

.matrix-remove {
    display: none;
}

.matrix-box {
    height: 20vh;
    width: 40%;
    display: flex;
    justify-content: center;
    align-items: center;
}

p {
    margin: 0 !important;
}

.envelope {
    color: white;
    width: 90%;
    height: 90%;
    border-radius: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

#ui {
    background-color: red;
}

#nui {
    background-color: orange;
}

#uni {
    background-color: blue;
}

#nuni {
    background-color: green;
}

.headers {
    width: 45%;
    text-align: center;
    padding-left: 15%;
}

.vertical-headers {
    width: 20%;
    transform: rotate(90deg);
    text-align: center;
}

#matrix-circle {
    text-align: center;
}

.fa-circle {
    font-size: 1.5em !important;
}

.ui-color {
    color: red;
}

.nui-color {
    color: orange;
}

.uni-color {
    color: blue;
}

.nuni-color {
    color: green;
}