Mobile Images in two columns

Site URL: https://www.yespeach.com.au/

Hi, Could someone help me please? 

I have images on my page with text. The text is 'heading 2'.

Problem 1
When the width of the page is getting close to changing to mobile the text is too big and gets split over two lines. Can I make the site change to mobile sooner so the images don't stay in four columns and get too small? 

Problem 2
In mobile, the image is huge! Can I make the images be in two columns, rather than one? so 2 images over 2 lines. 

Thank you in advance!

Hi,

Add to Design > Custom CSS

@media screen and (max-width:767px) {
div#page-section-626a0254c711d7246fbcef0b .span-3 {
    width: 50% !important;
    float: left !important;
}
div#page-section-626a0254c711d7246fbcef0b .span-3:nth-child(2n+1) {
    clear: left !important;
}}