#dropzone{
    position: relative;
    min-height: 200px;
    border: dashed 1px black;
    padding: 5px;
}
#dropzone:hover , #dropzone.hover{
    border: dashed 1px gray;
    cursor: pointer;
}
#dropzone input{
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}