.dropzone {
    width: 100%;
    height: 300px;
    border: 3px dashed #ccc;
    margin: 20px auto 20px;
    border-radius: 20px;
    font-size: 25px;
    cursor: pointer;
    text-align: center;
    vertical-align: middle;
    line-height: 300px;
    position: relative;

    & input[type="file"] {
        cursor: pointer;
        opacity: 0;
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}