ただただ、ブリンクするカーソルが欲しい場合のcss

初期値 lime

/*<span class="ef-blink"></span>*/
.ef-blink:after{content:'|';color:lime}
.ef-blink{opacity: 1;animation: blink 1s infinite}
@keyframes blink{ 0%{opacity:1}50%{ opacity:0}100% { opacity:1} }

あるいはinherit

/*<label class="lime"><span class="ef-blink"></span></label>*/
.lime{color:lime}
.ef-blink:after{content:'|';color:inherit}
.ef-blink{opacity: 1;animation: blink 1s infinite}
@keyframes blink{ 0%{opacity:1}50%{ opacity:0}100% { opacity:1} }