.img-baby-g-about {
width: 100%;
height: 327px;
animation: animateCloud 10s linear infinite;
background-image: url(https://i.postimg.cc/T1nt9ZLk/Lv8L0.png);
background-repeat: repeat-x;
background position: 0 0;
}
@keyframes animateCloud {0% {background position: 0 0;}100% {background-position: 1280px 0;}}
<div class="img-baby-g-about"></div>