I have for now created a workaround by creating a new rule in my site css (.button) and giving it a different colour background to make it more prominent. I created my own "hamburger" image and tried to add that to the .button style but without success. Suggestions on that would be welcome!
As an exercise I changed colour of the toggler icon as follows.
.navbar-light .navbar-toggler { border-color: rgba(49, 222, 54, 0.3); } .navbar-light .navbar-toggler-icon { background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='rgba(49,222,54, 0.5)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 8h24M4 16h24M4 24h24'/%3E%3C/svg%3E"); } |
This is the result

The following is probably too much information, but I'll put it there just in case.
- don't touch the original Bootstrap files
- create a new style sheet called styles.css or similar
- load styles.css after loading bootstrap.css or similar
- if an overriding style rule does not work, add !important
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