style.css

.marquee {
 width: 450px;
 margin: 0 auto;
 white-space: nowrap;
 overflow: hidden;
 box-sizing: border-box;
 border: 1px dotted #800000;
}

.marquee span {
 display: inline-block;
 padding-left: 100%;
 animation: marquee 15s linear infinite;
}

.marquee span:hover {
 animation-play-state: paused
}

@keyframes marquee {
 0%   { transform: translate(0, 0); }
 100% { transform: translate(-100%, 0); }
}