Customizr – mobile not working

I realised it was a format change I made to the widget area in the child theme
and it doesnt like it on the responsive site:

.widget-area {
background-color: #f6f6f6;
border-top: 2px solid #c0c0c0;
border-bottom: 2px solid #c0c0c0;
width: 1200px;
height: 160px;
}