style.css

* {
    box-sizing: border-box;
}

@media (max-width: 500px) {
    .color {
        width: 190px !important;
    }
    .color-hexa {
        width: 150px !important;
    }
    .data,.color,.color-hexa{
    font-size: 30px !important;
    font-size: 5vh !important;
    font-weight: 300 !important;
}
}

html,
body {
    padding: 0;
    margin: 0;
    width: 100%;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

.mouse-text {
    font-size: 18px;
    font-size: 3vh;
    letter-spacing: 10px; 
    text-align: center; 
}


#wrapper {
    z-index: 1;
    overflow-y:scroll;
    background-color: #333;
    margin: 25px auto;
    width: 90%;
    height: 60%;
    min-height: 255px;
    max-height: 500px;
}

#scroller {
    z-index: 2;
    height: 1550px;
    width: 100%;
    position: relative;
    margin-right: -15px;
}

.data {
    color: #333;
    text-align: center;
    font-size: 34px;
    font-size: 6vh;
    font-weight: 100;
}

.color,.color-hexa {
    width: 320px;
    font-size: 34px;
    font-size: 6vh;
    border: none;
    font-weight: 100;
    cursor: pointer;
    text-align: center;
}

.x,
.y,
.z {
    font-size: 1.0rem;
}

.text-in {
    border: none;
    outline: none;
    font-size: 3rem;
    color: #fff;
    width: 50%;
    position: relative;
    top: 200px;
    left: 50%;
    margin-left: -25%;
    background-color: transparent;
    text-align: center;
    font-weight: 200;
}

.author {
    font-size: 12px;
    text-align: center;
    margin: 80px 0 40px;
}
.author a {
    text-decoration: none;
    font-weight: 200;
}