Thank you for your answer, Gareth
I was trying to investigate problem using browser development tools, but I'm not familiar with the
CSS, so I could not understand from whom the property is inherited. It seems to me that this is due to bootstrap, at list code below
slightly changes the appearance (in some places the blue background disappears)
The problem still exists. I'm not even upset about the color when clicking on the links, but the color when clicking on the site logo in the upper left corner of the header.
:focus {
outline-style: none;
outline-width: 0px !important;
outline-color: none !important;
}
a.active.focus,
a.active:focus,
a.focus,
a:active.focus,
a:active:focus,
a:focus,
button.active.focus,
button.active:focus,
button.focus,
button:active.focus,
button:active:focus,
button:focus,
.btn.active.focus,
.btn.active:focus,
.btn.focus,
.btn:active.focus,
.btn:active:focus,
.btn:focus {
outline: 0!important;
outline-color: transparent!important;
outline-width: 0!important;
outline-style: none!important;
box-shadow: 0 0 0 0 rgba(0,123,255,0)!important;
}