Changes

.navbox {                    /* Navbox container style */

.navbox {                    /* Navbox container style */

box-sizing: border-box;

box-sizing: border-box;

border: 0px solid #a2a9b1;

border: 1px solid #a2a9b1;

width: 100%;

width: 100%;

clear: both;

clear: both;