* {
    background-color:#979afb;
}

nav {
    background-color: blue;
    background-size: cover;
    font-size: 30px;
    text-align: left;
    text-align: top;
    padding-right: 15px;
    padding-top: 10px;
    margin: 5px;
}

nav a {
    display: inline-block;
    background-color: aliceblue;
    border-radius: 4px;
}

.berry {
    width: 400px;
    display: block;
    animation-name: slide;
    animation-duration: 3s;
    animation-fill-mode: forwards;
    position: relative; 
    animation-iteration-count: infinite;
}

@keyframes slide {
    from { transform: translateX(0); }
    to { transform: translateX(600px); }
}