Moodul:Side box/styles.css

th.sbox-text, td.sbox-text {   /* The message body cell(s) */
    border: none;
    /* @noflip */
    padding: 0.25em 0.9em;     /* 0.9em left/right */
    width: 100%;               /* Make all sboxes the same width regardless of text length */
}
td.sbox-image {                /* The left image cell */
    border: none;
    /* @noflip */
    padding: 2px 0 2px 0.9em;  /* 0.9em left, 0px right */
    text-align: center;
}
td.sbox-imageright {           /* The right image cell */
    border: none;
    /* @noflip */
    padding: 2px 0.9em 2px 0;  /* 0px left, 0.9em right */
    text-align: center;
}

table.sbox-small {   /* For the "small=yes" option. */
    clear: right;
    float: right;
    margin: 4px 0 4px 1em;
    width: 238px;
    font-size: 88%;
    line-height: 1.25em;
}
table.sbox-small-left {   /* For the "small=left" option. */
    margin: 4px 1em 4px 0;
    width: 238px;
    border-collapse: collapse;
    font-size: 88%;
    line-height: 1.25em;
}