Column width mobile

Hi,

how can i change the global width of the column
on mobile devices?

Is there a way to set this in the Theme Editor,
or do i have to change each css-selector:

.responsive #top #wrap_all .flex_cell.av-11wp0s-75a00f547907a743bb31a45977eec402 {
    padding: 100px 100px 100px 100px !important;
}