*{box-sizing: border-box;}

ul.gnav-navi1-1{
.box-max-width:100%;max-height: 70px;
 border: solid 1px red;
padding: 0;
text-align: center;
font-size: 50px;
font-weight: bold;
ul.gnav-navi1-1 li{
display: block;
}