Ghost/core/client/app/styles/components/badges.css

/* Badges
/* ---------------------------------------------------------- */

.badge {
    display: inline-block;
    padding: 2px 4px;
    min-width: 10px;
    background-color: #777;
    border-radius: 10px;
    box-shadow: 0 0 0 1px #777;
    color: #fff;
    vertical-align: baseline;
    text-align: center;
    white-space: nowrap;
    font-size: 1rem;
    line-height: 1;
    font-weight: inherit;
}

.badge:empty {
    display: none;
}

.btn .badge {
    position: relative;
    top: -1px;
}

.btn-xs .badge {
    top: 0;
    padding: 1px 5px;
}

p .badge {
    position: relative;
    top: -2px;
    margin-left: -1px;
    padding: 0 4px 3px;
}

.nav-pills > li > a > .badge {
    margin-left: 3px;
}

.nav-item .badge {
    margin-top: -5px;
    margin-left: 3px;
}

a.badge:hover,
a.badge:focus {
    color: #fff;
    text-decoration: none;
    cursor: pointer;
}


/* Colour variations
/* ---------------------------------------------------------- */

.badge.badge-blue {
    background-color: var(--blue);
    box-shadow: 0 0 0 1px var(--blue);
}

.badge.badge-green {
    background-color: var(--green);
    box-shadow: 0 0 0 1px var(--green);
}

.badge.badge-red {
    background-color: var(--red);
    box-shadow: 0 0 0 1px var(--red);
}