<h1 class="marquee"><span>Ваш текст бегущей строки</span></h1>

@-webkit-keyframes scroll {
    0% {
        -webkit-transform: translate(0, 0);
        transform: translate(0, 0);
    }
    100% {
        -webkit-transform: translate(-100%, 0);
        transform: translate(-100%, 0)
    }
}
 
@-moz-keyframes scroll {
    0% {
        -moz-transform: translate(0, 0);
        transform: translate(0, 0);
    }
    100% {
        -moz-transform: translate(-100%, 0);
        transform: translate(-100%, 0)
    }
}
 
@keyframes scroll {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(-100%, 0)
    }
}
 
.marquee {
    display: block;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
}
 
.marquee span {
    display: inline-block;
    padding-left: 100%;
    -webkit-animation: scroll 5s infinite linear;
    -moz-animation: scroll 5s infinite linear;
    animation: scroll 5s infinite linear;
}