Go to header.php and paste this code:
You can adjust 800px and 2000px until you are satisfied.
CSS:
<style>
@media only screen and (min-width: 800px) {
/* Css for Desktop goes here*/
.mh-container {
min-width: 800px;
max-width: 2000px;
margin-right: auto;
margin-left: auto;
}
}
</style>
You can adjust 800px and 2000px until you are satisfied.