revert.css

.header {
    color: #333;
 	background-color: #f5f5f5;
}

.header .header-logo-wordmark, /* Gist logo */
.header .header-logo-invertocat, /* Github logo */
.header .header-nav-link, /* Other things on the header */
.header .header-search-wrapper.form-control *,
.header .header-search-wrapper.form-control.focus * {
    color: #555;
}

.header .header-logo-wordmark:hover,
.header .header-logo-wordmark:focus,
.header .header-logo-invertocat:hover,
.header .header-logo-invertocat:focus,
.header .header-nav-link:hover,
.header .header-nav-link:focus {
 	color: #4078c0;
}

.header .header-nav-link:hover .dropdown-caret,
.header .header-nav-link:focus .dropdown-caret {
    border-top-color: #4078c0;
}

.header .header-search-wrapper {
    min-height: 0;
 	background: #fff !important;
    font-size: 14px;
    line-height: 20px;
    border: 1px solid #ddd;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.075);
}

.header .header-search-input {
    background: none;
    min-height: 26px;
    font-size: 14px;
}

.header .header-search-input::-webkit-input-placeholder {
 	color: #999;   
}

.header .header-search-input::-moz-placeholder {
 	color: #999;   
}

.header .header-search-input:-moz-placeholder {
 	color: #999;   
}

.header .header-search-input:-ms-input-placeholder {
 	color: #999;   
}

.header .header-search-scope {
    font-size: 12px;
    line-height: inherit;
    border-right: 1px solid #eee;
}

.header .header-search-wrapper.focus {
 	border-color: #51a7e8;
    outline: none;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.075),
                0 0 5px rgba(81,167,232,0.5);
}

.header .header-search-wrapper.focus .header-search-scope {
    background-color: #edf2f9;
    border-color: #c6d7ec;
}