Works around problem with Hum WordPress theme in IE7 (can help IE6 too), copies responsive styles to a separate stylesheet, which can be included only if IE7 (or IE6) is used. Posted here: http://wordpress.org/support/topic/header-logo-and-menu-ie7-layout?replies=2#post-4054505

styleIE7.css

/**
 * Attempts to solve a problem with IE7 and Hum theme
 * described here: http://wordpress.org/support/topic/ie7
 */

#site-title a {
	font-size: 3.6em;
}

#main {
	padding: 2em 0 0;
}

#page,
#branding {
	margin-top: 0;
	padding-top: 0;
}

#branding {
	position: relative;
	width: auto;
	margin: 0 7.6%;
	text-align: center;
}

#site-title {
	padding-top: 40px;
	float: none;
}

#site-title a {
	font-size: 3.6em;
}

#page #branding #searchform {
	position: absolute;
	right: 0;
	margin-bottom: 0.3em;
}

#main,
#colophon {
	margin-left: 0;
}

#page #branding #searchform {
	position: relative;
	right: auto;
	top: 0 !important;
}

#page #branding #s {
	margin: 0 auto;
	float: none;
	display: block;
}

#access ul {
	margin: 0 7.6%;
}

#access li {
	display: inline-block;
	float: none;
	margin: 0 10px;
}

#access ul ul {
	left: auto;
	margin-left: 0;
}

/* -------------------------------------------------------------------------
**   Undo hovered branding
** ------------------------------------------------------------------------- */
#page #branding #site-title a {
	color: rgba( 0, 0, 0, 0.75 );
}       

#page #branding #access a {
	color: #555;
}       

#page #branding #access .current_page_item > a,
#page #branding #access .current_page_ancestor > a {
	color: #222;
}

#page #branding #site-description {
	color: #7A7A7A;
}

#page #branding #searchform {
	opacity: 1;
}

#site-title a {
	font-size: 2.4em;
}

#page #branding #searchform {
	position: relative;
	right: auto;
	top: 0 !important;
}

#page #branding #s {
	margin: 0 auto;
	float: none;
	display: block;
}

#access li {
	display: inline;
	float: none;
}

.format-quote header .entry-meta {
	margin-left: 22.8%;
}

.commentlist {
	margin-left: 0;
}

.comment-meta {
	overflow: hidden;
	padding-top: 10px;
}
.commentlist li.comment .fn {
	display: block;
}
.commentlist .avatar {
	float: left;
	margin-top: -10px;
	margin-right: 10px;
	margin-bottom: 5px;
}

.comment-content {
	padding-top: 7px;
}