loading{
    display: block;
    position: fixed;
    z-index: 10;
    height: 10px;
    width: 300px;
    left: -300px;
    bottom: 0;
    border-radius: 20px;
    background-image: linear-gradient(to right, black , grey);
    animation:load 1s ease-in infinite;
} @keyframes load { from {left: -200px;} to {left: 100%} }