I created a colorful box using bootstrap. I try to add a horizontal line which goes from left to right as shown in second picture. I try to add new div having border in button but it did not fit in whole width of box.
There few limitation in Bootstrap 3 for removing columns padding You need to write p-0 class with padding: 0 !importantCSS and add p-0 class in all right section. I just updated your code, i hope it'll help you to fix this :