.cursor {
    display: inline-block;
    width: 2px;
    background-color: #ffffff;
    animation: blink 1s infinite;
    margin-left: 2px;
    height: 2em;
    vertical-align: middle;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}