HTMLify

* {
    margin: 0;
    padding: 0;
}

.container {
    min-height: 100vh;
    display: grid;
    place-items: center;
    scroll-behavior: smooth;
    background: #131313;
    font-family: 'Helvetica Neue', sans-serif;
}

h1 a {
    font-size: 80px;
    color: #e1c540;
    text-decoration: none;
    text-transform: uppercase;
}

.popover {
    display: none;
    box-shadow: 0px 6px 8px rgba(19, 19, 19, .7);
}

.popover:target {
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.popover .content {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 0;
    height: 0;
    color: #fff;
    background-color: #191919;
    animation: 1s grow ease forwards;
    text-align: center;
}

.nav_list {
    list-style-type: none;
}

.nav_list a {
    text-decoration: none;
    font-size: 50px;
    color: #fff;
}

.nav_list_item {
    height: 100%;
    overflow: hidden;
}

.nav_list li {
    padding: 15px 0;
    text-transform: uppercase;
    transform: translateY(200px);
    opacity: 0;
    animation: 2s slideUp ease forwards .5s;
    position: relative;
}

.nav_list li::before {
    content: '';
    position: absolute;
    height: 2px;
    width: 0px;
    left: 0;
    bottom: 10px;
    background: #e1c540;
    transition: all .5s ease;
}

.nav_list li:hover:before {
    width: 100%;
}

.popover p {
    padding: 50px;
    opacity: 0;
    animation: 1s fadeIn ease forwards 1s;
}

.popover .close::after {
    content: "×";
    width: 50px;
    height: 50px;
    position: absolute;
    right: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    font-size: 30px;
    background-color: #e1c540;
    color: #191919;
    cursor: pointer;
    opacity: 0;
    animation: 1s fadeIn ease forwards .5s;
}

@keyframes grow {
    100% {
        height: 90%;
        width: 90%;
    }
}

@keyframes fadeIn {
    100% {
        opacity: 1;
    }
}

@keyframes slideUp {
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}