@tuanphan I tried the code below. I'm not sure if it's okay because I know nothing about CSS or anything related to code. Do I need to do something different?
@media screen and (max-width:767px) {
div#page-section-62c57fc1f9f91a0d1160e037 .span-6 {
width: 50% !important;
float: left !important;
}
div#page-section-62c57fc1f9f91a0d1160e037 .button-block a {
padding-left: 0.75em !important;
padding-right: 0.75em !important;
padding-top: 1em !important;
padding-bottom: 1em !important;
display: flex;
align-items: center;
justify-content: center;
}
}