Thick underline behind text

Another possibility:

p {
    font-size: 100px;
    font-family: arial;
}

span {
    padding: 0 10px;
    box-shadow: inset 0 -40px 0 0 magenta;
}

span:nth-child(2) {
    box-shadow: inset 0 -55px 0 0 magenta;
}

span:nth-child(3) {
    box-shadow: inset 0 -70px 0 0 magenta;
}
<p>
    <span>A</span><span>B</span><span>C</span>
</p>

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