* {
    box-sizing: border-box;
}

.topnav {
    background-color: hsla(209, 20%, 25%);
    overflow: hidden;
    position: fixed;
    top: 0;
}


/* Style the links inside the navigation bar */

.topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}


/* Change the color of links on hover */

.topnav a:hover {
    background-color: rgb(46, 103, 196);
    color: white;
}


/* Add a color to the active/current link */

.topnav a.active {
    background-color: rgba(59, 130, 246);
    color: white;
}

body {
    height: 100vh;
    display: flex;
    margin: 0;
    align-items: center;
    justify-content: center;
    background-color: #282c34;
}

#container {
    width: 25vmin;
    height: 25vmin;
    perspective: 200vmin;
}

#lesch {
    align-self: center;
    vertical-align: middle;
    border-radius: 20%;
}

#cube {
    position: relative;
    width: 25vmin;
    height: 25vmin;
    transform-style: preserve-3d;
}

#cube .side {
    width: 25vmin;
    height: 25vmin;
    position: absolute;
    text-align: center;
    line-height: 25vmin;
    font-size: 8vmin;
    color: #fff;
    font-family: Arial, Helvetica, serif;
    opacity: 0.8;
    transition: transform 1s;
    border: 2px solid #ccc;
}

#cube .side.front {
    background-color: #586ba4;
    transform: translateZ(12.5vmin);
}

#cube .side.back {
    background-color: #324376;
    transform: rotateY(180deg) translateZ(12.5vmin);
}

#cube .side.left {
    background-color: #f5dd90;
    transform: rotateY(-90deg) translateZ(12.5vmin);
}

#cube .side.right {
    background-color: #f68e5f;
    transform: rotateY(90deg) translateZ(12.5vmin);
}

#cube .side.top {
    background-color: #f67c5e;
    transform: rotateX(90deg) translateZ(12.5vmin);
}

#cube .side.bottom {
    background-color: #4c8270;
    transform: rotateX(-90deg) translateZ(12.5vmin);
}