body {
    background-color: blueviolet;
}

#slider-container {
    margin: 0 auto;
}

#image1, #image2 {
    position: absolute;
    top: 20px;
    left:20px;
    height: 600px;
    width: 600px;
}

#image1 {
    z-index: 2;
    cursor: pointer;
}

#image2 {
    z-index: 1;
}

a {
    display: block;
    color: #6b6b6b;
    text-decoration: none;
    font-size: 48px;
    padding: 10px;
    position: absolute;
}

a:hover {
    color: #000;
}

#next, #prev {
    top: 730px;
    left: 320px;
}

#prev {
    left: 280px;
}

.thumbs {
    cursor: pointer;
    width: 120px;
    height: 120px;
    position: absolute;
    top: 630px;
    border: 1px solid #fff;
} 

.active {
    border: 4px solid #fff;
}

#thumb1 {
    left: 20px;
}

#thumb2 {
    left: 140px;
}

#thumb3 {
    left: 260px;
}

#thumb4 {
    left: 380px;
}

#thumb5 {
    left: 500px;
}