How to remove the blue highlight of button on mobile?

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I try to remove the blue box that appears on click in front of buttons as you can see below: My button

Before asking, I have made a lot of research, I have tried the solutions given by the following topics:

I have tried all the answers! It works on computer but not on mobile.

If you are using a computer, you can try by simulating mobile with the inspector. Here is the button: https://jsfiddle.net/t4ykshst/

#add {
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    outline: none;
    cursor: pointer;
    padding: 10px;
    overflow: hidden;
    border: none;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    background: #1abc9c;
    -webkit-box-shadow: 0 4px 3px 2px rgba(0, 0, 0, 0.2);
    box-shadow: 0 4px 3px 2px rgba(0, 0, 0, 0.2);
}

#add:active {
    opacity: 0.85;
    -webkit-box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.2);
    box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.2);
}
<input type="button" id="add" value="+" title="" style="position: absolute; left: 0px; top: 0px; width: 52px; height: 52px;" />

7 Answers
* {
    -webkit-tap-highlight-color: transparent;
}

Test it.

There will be no highlighting (at least in Chrome 88+) at all if you remove cursor: pointer from #add selector. And if you need it in the "desktop" mode, use something like this:

@media (min-width: 768px) {
    #add {
        cursor: pointer;
    }
}

You just need to add style="-webkit-tap-highlight-color: transparent;"

-webkit-tap-highlight-color is a non-standard feature (mdn). It won't work in browser like safari 14.

Instead, you can use

{ outline: none; }

or apply it specifically through selector

a:focus,a:visited,a:active{
  outline: none;
}

Try it

add to the button style "cursor: default;"

This will make a cursor:pointer; it turns into a "default", but will remove the blue shadow on the buttons on the mobile screen as you want

In addition to all the answers here, you have to also specify the background css property explicitly yourself to the button.

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