h1 {
	text-align:center;
	font-size:160%
}

form {
	text-align:center; /* For inner inline blocks */
}

span.inline_half {
	margin: 0;
	padding: 0;
	display:inline-block;
	vertical-align: top;
	width:50%;
	min-width:28em;
	text-align:left; /* Clear parent trick */
}

fieldset {
	margin: 0 0.5em 0.5em 0.5em;
}

fieldset>label {
	display:inline-block;
	text-align:right;
	width: 12em;
}

.tree_add {
	display:block;
	float:right;
}