Look for the .one-third
class inside the Column Classes section. It’s located around line 768
.one-third,
.two-sixths {
width: 31.623931623931625%;
}
At the moment you have it set to 31, you can start off by changing it to 32 to see if that works. If you need the divs to spread more, then you’ll have to adjust the margin-left.
It looks like you changed the margin-left in this section (around line 759) –
.five-sixths,
.four-sixths,
.one-fourth,
.one-half,
.one-sixth,
.one-third,
.three-fourths,
.three-sixths,
.two-fourths,
.two-sixths,
.two-thirds {
float: left;
margin-bottom: 20px;
margin-left: 1%;
}