robind.css

.moving {
    animation-duration: 3s;
    animation-name: slidein;
    animation-iteration-count: 1;
    animation-direction: alternate;
    animation-fill-mode: forwards;
}

nav {
    border-bottom: 1px solid black;
}

.backs ol {
    list-style-type: none;
    padding-left: 0;
}

.back {
    display: inline-block;
}

.back a::after {
    display: inline-block;
    color: #000;
    content: '>';
    font-size: 80%;
    font-weight: bold;
    padding: 0 3px;
}

html{
    background-color: purple;
}

#inner {
    display: flex;
    justify-content: center;
    width: 100%;
    flex-direction: column;
    align-items: center;
}

#invis {
    font-size: 0;
    color:transparent;
}

body {
    background-color: purple;
}

#container {
    background-color: #EEE;
    border: 5px solid navy;
    border-radius: 10px;
    color: #444;
    font-size: 18px;
    line-height: 1.6;
    margin: 40px auto;
    max-width: 650px;
    padding: 20px;
}

h1,h2,h3{
    line-height: 1.2;
}

h1{
    text-align: center;
}

@keyframes slidein {
    from {
        margin-left: 0%;
    }

    99% {
        width: 300px;
    }

    to {
        margin-left: 100%;
        opacity: 0;
        height: 1%;
        width: 1%;
    }
}

.styled {
    cursor: pointer;
    border: 0;
    line-height: 2.5;
    padding: 0 20px;
    font-size: 1rem;
    text-align: center;
    color: #EEE;
    text-shadow: 1px 1px 1px #000;
    border-radius: 10px;
    background-color: rgba(124, 30, 178, 1);
    background-image: linear-gradient(to top left, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.2) 30%, rgba(0, 0, 0, 0));
    box-shadow: inset 2px 2px 3px rgba(255, 255, 255, 0.6), inset -2px -2px 3px rgba(0, 0, 0, 0.6);
}

.styled:hover {
    background-color: rgba(144, 30, 178, 1);
}

.styled:active {
    box-shadow: inset -2px -2px 3px rgba(255, 255, 255, 0.6), inset 2px 2px 3px rgba(0, 0, 0, 0.6);
}