center image in selfmade theme

Ok i think it’s solved!

I looked in my bought “Tatami” Theme from Ellen Bauer. There is a entry that’s called allignment. I put this in my CSS and it worked:

.aligncenter {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

I found another two entries for left and right:

.alignleft {
	float: left;
	margin-right:16px;
}
.alignright {
	float: right;
	margin-left:10px;
}