Use the following code:
<div style="width:40%;text-align:center;" >
<marquee style="color:gray;font-size:42px;" behavior="alternate" direction="left">...</marquee>
</div>
Use the following code:
<div style="width:40%;text-align:center;" >
<marquee style="color:gray;font-size:42px;" behavior="alternate" direction="left">...</marquee>
</div>