We updated this custom css rule into your site, kindly check:
.vm-customfields-wrap .product-field-display {
display: block!important;
margin-left: 0!important;
}
.vm-customfields-wrap .chosen-container-single {
min-width: 250px;
margin: 5px 0;
}
.vm-customfields-wrap .chosen-container-single .chosen-single {
border-color: #eaeaea;
box-shadow: none;
border-radius: 0;
background: #fff;
height: 50px;
padding: 13px 20px;
}
.vm-customfields-wrap .chosen-container-single .chosen-single div b {
background-position: 0 14px;
}
.vm-customfields-wrap .chosen-container .chosen-drop {
border-color: #eaeaea;
}
in the file: /templates/ja_autoshop/css/custom.css