When using a <label> as an .input-group-addon, there will be a default margin-bottom of .5rem via Reboot.
This will lead to undesirable whitespace below the label and the <input> will become taller than needed. By removing the margin, it will play nice with <label> elements.
Closes #19012
.input-group-addon {
padding: $input-padding-y $input-padding-x;
+ margin-bottom: 0; // Allow use of <label> elements by overriding our default margin-bottom
font-size: $font-size-base;
font-weight: normal;
line-height: 1.5;