body{
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
h1{
    margin: 0;
    padding: 0;
    font-size: 120px;
    text-transform: uppercase;
    position: relative;
    color: #ccc;
}
h1::before{
    content: 'codehack';
    position: absolute;
    top: 0;
    left: 0;
    color: #262626;
    width: 0%;
    overflow: hidden;
    transition: all 0.5s;
}
h1:hover::before{
    width: 100%;
}