div#dropzone {
    border-radius: 10px;
    border:        3px dashed #aaa;
    height:        400px;
    left:          50%;
    position:      relative;
    top:           50%;
    transform:     translate(-50%, -50%);
    width:         700px;
}

div#dropzone p {
    color:     #aaa;
    display:   inline-block;
    left:      50%;
    margin:    0;
    position:  relative;
    top:       50%;
    transform: translate(-50%, -50%);
}

div#dropzone.drop-hover {
    border: 3px dashed white;
}

div#dropzone.drop-hover p {
    color: white;
}