style.css

body {
    margin: 0 auto;
    width:80%;
}

.drop-message {
    color: rgb(230, 154, 167);
    font-size: 18pt;
    font-weight: 100;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}

#drop-region {
    margin-top: 40px;
    height: 400px;
    background-color: #fff;
    border-radius:20px;
    box-shadow:0 0 35px rgba(0,0,0,.3);
    padding:60px 40px;
    text-align: center;
    cursor:pointer;
    transition: .3s;
}

#drop-region:hover {
    box-shadow:0 0 45px rgba(0,0,0,.4);
}
 
#image-preview {
    margin-top:20px;
}

#image-preview .image-view {
    display: inline-block;
    position:relative;
    margin-right: 13px;
    margin-bottom: 13px;
}

#image-preview .image-view img {
    max-width: 150px;
    max-height: 150px;
}

#image-preview .overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    right: 0;
    z-index: 2;
    background: rgba(255,255,255,0.2);
}