CSS changes to crawley theme

I am working on changes to the Tagline in the header.
all was going well until the text suddenly aligned left when I set the width. What did I do wrong and how do I fix it?
any help would be great.

.crowley-site-description{
font-size: 14px;
font-weight:bold;
background-color: #FEFFEA;
color:#61CC33;
width: 350px;
text-align: center
border-radius: 25px;

}