Hi! I'm not using one of your themes so if you don't want to answer the question I don't blame you. On my side blog RachRiposte the ask box loads in a weird way. When I click the Ask button from the main page or from a post it does a bounce that's kind of angled. The other links do a bounce so I assume it's part of the loading, but the ask page is weird. I also want to round the corners of the ask box like the rest of the theme if it's possible. Can you help please? Thank you!
as you've said, it's not one of my themes, so i went ahead and checked the theme maker's terms of use for you - since they say it's cool to make minor edits, good news! i can try and answer this for you :D
by "bounce", i'm assuming you mean the way the whole page loads a little below where it's supposed to be, then after a second jumps up to the correct position? i'm not seeing any other movement that could qualify as a bounce on either the Ask link in the navigation bar or the actual ask box... if that's what you mean, then yeah, it looks like it's part of the loading done by tumblr and the theme itself. can't help you there, sorry :(
HOWEVER! for rounding the corners of the ask box (assuming you mean the light gray container here, not the actual white ask frame) - you can add the following line to your blog's Custom CSS (found under Advanced Options at the bottom of your Customize page):
.entry-text { border-radius: 5px }