1) Click here to open your Weebly Editor
2) Click into “design” then into “edit html/css”
3) Click into “main_style.css”
4) Here locate this code:
#navigation ul li#active a, #navigation a:hover {
border-top: 3px solid #2ec5cc;
}
5) You can change the HEX color code highlighted above to change the color of the strip. You can find your color code here: http://colorpicker.com/
6) Once complete, save your change and re-publish your website