Prevent button width from changing Basic CSS - html

Question

Basic css question here.
Every time I press "Check all", the button populates with the names from a list (which is fine).
The issue is: The button width itself expands and gets bigger. I want to keep it fixed. Furthermore, how can I set a limit to the number of list items it can show? So for example, if there are a lot of items, after "test 5", a "..." should appear.
By the way: this is all in my custom.css, .btn-default is actually from bootstrap, but I wanted to change some things in my multi select-class. I changed caret margin because the caret was right beside the text, I wanted it to be to the VERY right, maybe that's what's messing everything up??
custom.css :
.sv-manage-multiselect-dropdown {
.btn-default {
background-image: none;
border: 1px solid #ADA9A9;
padding: 6px 8px 1px 8px ;
}
.btn .caret {
margin-left: 160px;
margin-bottom:5px;
}
}
Html:
<td class="col-xs-2">
<am-multiselect class="sv-manage-multiselect-dropdown"
ng-model="Mylist.names"
options="Names.name for link in Mylist"
multiple="true"
ms-selected="{{Mylist.names}}"
</am-multiselect>
</td>
Before:
After:

Answer 1

Have you tried using max-width in your css?
max-width: 40px;
For example.
Hope this helps!

Answer 2

I looked in angular-multiselect/src/multiselect.tmpl.html, adding this css should work, 10px is just for the example, put width and height of the checkmark, like this <i> will fill same place even if it's void:
.sv-manage-multiselect-dropdown {
ul.dropdown-menu > li > i{
display: inline-block;
min-width: 10px;
min-height: 10px;
}
}