.form-register select{
    -webkit-appearance: none;
       -moz-appearance: none;
            appearance: none;
    -moz-text-align-last: center;
         text-align-last: center;
    border-radius: 2.4rem;
    -webkit-box-sizing: border-box;
            box-sizing: border-box;
    color: #E0E0E0;
    height: 4.8rem;
    line-height: 4.8rem;
    padding: 0 1rem;
    text-align: center;
    width: 100%;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100' fill='%23E0E0E0'><polygon points='0,0 100,0 50,50'/></svg>") no-repeat;
    background-size: 14px;
    background-position: calc(100% - 20px) 60%;
    background-repeat: no-repeat;
    background-color: rgba(0,0,0,0.7);
}
.form-register select::-ms-expand {
    display: none;
}
.form-register #categorizacion option, .form-register #provincia option{text-indent:0;text-align:center;padding: 0!important;}

@media(max-width:767.98px){
    .form-register select{
        padding: 0 6rem;
        padding-left: 6rem;
        padding-right: 6rem;
    }
    .form-register #categorizacion option, .form-register #provincia option{padding-left: 6rem;padding-right: 6rem;text-align: center;}

}