<input maxlength='7' value='0123456'/>
$char-w: 1ch;
$gap: .5*$char-w;
$n-char: 7;
$in-w: $n-char*($char-w + $gap);
input {
display: block;
margin: 2em auto;
border: none;
padding: 0;
width: $in-w;
background: repeating-linear-gradient(90deg,
dimgrey 0, dimgrey $char-w,
transparent 0, transparent $char-w + $gap)
0 100%/ #{$in-w - $gap} 2px no-repeat;
font: 5ch droid sans mono, consolas, monospace;
letter-spacing: $gap;
&:focus {
outline: none;
color: dodgerblue;
}
}
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