I've found the following CSS code that I pasted in the child theme's css stylesheet, but it doesn't work.
/* Mobiles in Potrait mode */
@media only screen
and (max-width : 320px) {
.widget-area {
float: left;
width: 100%;
background: #E3E3E3;
}
}
/* Mobiles in landscape mode */
@media only screen
and (min-width : 321px)
and (max-width : 480px) {
.widget-area {
float: left;
width: 100%;
background: #E3E3E3;
}
}
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