Syntax Error Message

Site URL: https://arugula-iris-j5k6.squarespace.com/config/design/custom-css

I have made the large size button very large on this site, and when I go to mobile size, the left side of the border goes away. I'm trying the following code to see if I can keep it on screen at mobile size, but I'm getting a syntax error message for the first line. Can anyone tell me what's wrong with my code or another way to do this?

@media screen and (max-width: 640px) {

.content-wrapper {

max-width: 400px }

}

9 hours ago, kimimischke said:

Site URL: https://arugula-iris-j5k6.squarespace.com/config/design/custom-css

I have made the large size button very large on this site, and when I go to mobile size, the left side of the border goes away. I'm trying the following code to see if I can keep it on screen at mobile size, but I'm getting a syntax error message for the first line. Can anyone tell me what's wrong with my code or another way to do this?

@media screen and (max-width: 640px) {

.content-wrapper {

max-width: 400px }

}

I tried to paste into my custom css panel it still working right, could you show a screen capture?