Outline radius?

Old question now, but this might be relevant for somebody with a similar issue. I had an input field with rounded border and wanted to change colour of focus outline. I couldn’t tame the horrid square outline to the input control.

So instead, I used box-shadow. I actually preferred the smooth look of the shadow, but the shadow can be hardened to simulate a rounded outline:

input, input:focus {
    border: none;
    border-radius: 2pt;
    box-shadow: 0 0 0 1pt grey;
    outline: none;
    transition: .1s;
}
/* Smooth outline with box-shadow: */
.text1:focus {
    box-shadow: 0 0 3pt 2pt cornflowerblue;
}

/* Hard "outline" with box-shadow: */
.text2:focus {
    box-shadow: 0 0 0 2pt red;
}

<input class="text1"> 
<br>
<br>
<input type=text class="text2">