.body {
    margin: 0;
    padding: 0;
}
ul {
    position:relative;
    margin: 0;
    padding: 0;
    width: 100%;
    display: flex;
}
ul li {
    width: 100%;
    height:auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0);
    list-style: none;
    animation: 10s change linear infinite;
}
@keyframes change {
    0%{
        background: #00B8AB;
    }
    20%{
        background: #007575;
    }
    40%{
        background: #80FFF7;
    }
    60%{
        background: #00C7C0;
    }
    80%{
        background: #009E91;
    }
    100%{
        background: #00B8AB;
    }
}