body {
    margin: 0;
    font-family: "Century Gothic";
}

.comparison-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.back-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url('images/1a.jpg');
    background-size: cover;
    background-attachment: fixed;
}

.front-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url('images/2a.jpg');
    background-size: cover;
    background-attachment: fixed;
}