.enquiry a
{
 background: url("https://www.offshoreindiadataentry.com/images/Banner-Enquire.png") no-repeat scroll right top rgba(0, 0, 0, 0);
    display: block;
    height: 70px;
    position: fixed;
   left:-06%;
   top:40%;
    margin:0 auto;
    text-align: center;
    width: 206px;
    z-index: 9999;
}
.rotate90 {
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    transform: rotate(90deg);
}