<div class="alert alert-info" style="overflow:hidden;">
<div class="marquee">
<div>
AAA
</div>
</div>
</div>
.marquee div {
display: block;
width: 100%;
height: 30px;
position: relative;
left: 100%
overflow: hidden;
animation: marquee 5s linear infinite;
}
@keyframes marquee {
0% {
left: 100%;
}
100% {
left: 0;
}
}