#ext_cnt #idx .blc-frm{ text-align:center; }
#ext_cnt #idx .blc-frm > form{ max-width:800px; margin:0 auto; text-align:left; }
#ext_cnt #idx .blc-frm > form > .inp:last-of-type{ grid-column:1 / -1; }
#ext_cnt #idx .blc-frm textarea{ min-height:12em; }
@media(max-width:600px){ #ext_cnt #idx .blc-frm > form > .inp:last-of-type{ grid-column:auto; } }