It is easy to put a border around this flag image
Own work 

.mw-parser-output .responsive-license-cc{clear:both;text-align:center;box-sizing:border-box;width:100%;justify-content:space-around;align-items:center;margin:0.5em auto;background-color:#f9f9f9;border:2px solid #e0e0e0;border-spacing:8px;display:flex}.mw-parser-output .responsive-license-cc div{margin:4px}.mw-parser-output .rlicense-text div{margin:0.5em auto}@media screen and (max-width:640px){.mw-parser-output .responsive-license-cc{flex-flow:column}.mw-parser-output .rlicense-text{order:1}} This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
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SVG file by Luís Flávio: Please note that it is not 100% accurate as I couldn't find enough information about the flag. I did it because I couldn't find any SVG of it. This is the first SVG file I built. If you can, please update it to make it better!