web/css/texmath.css

/* style for html inside of browsers */
.katex { font-size: 1em !important; } /* align KaTeX font-size to surrounding text */

eq { display: inline-block; }
eqn { display: block}
section.eqno {
    display: flex;
    flex-direction: row;
    align-content: space-between;
    align-items: center;
}
section.eqno > eqn {
    width: 100%;
    margin-left: 3em;
}
section.eqno > span {
    width:3em;
    text-align:right;
}