@media only screen and (min-width : 320px) and (max-width : 480px) {
	ul#main_menu {
 
    list-style-type: none;
    margin: 0 auto;
    padding-top: 20px;
}
ul#main_menu li {
    display: inline-block;
width:320px;
    text-align: center;
    float: left;
}

li#implantcad {
     margin-right: 0; margin-bottom:2rem;
}



}
@media only screen and (min-width : 360px) and (max-width : 480px) {
	ul#main_menu {
 
    list-style-type: none;
    margin: 0 auto;
    padding-top: 20px;
}
ul#main_menu li {
    display: inline-block;
width:320px;
    text-align: center;
    float: left;
}

li#implantcad {
     margin-right: 0; margin-bottom:2rem;
}



}
@media only screen and (min-width : 480px) and (max-width : 595px) {/*--- Mobile landscape ---*/}
@media only screen and (min-width : 595px) and (max-width : 690px) {/*--- Small tablet portrait ---*/}
@media only screen and (min-width : 690px) and (max-width : 800px) {/*--- Tablet portrait ---*/}
@media only screen and (min-width : 800px) and (max-width : 1024px) {/*--- Small tablet landscape ---*/}
@media only screen and (min-width : 1024px) and (max-width : 1224px) {/*--- Tablet landscape --- */}