use protocol-relative urls in theme

themes/kwant/assets/css/theme.css

@@ -256,8 +256,8 @@ th {
 }
 @font-face {
   font-family: 'Glyphicons Halflings';
-  src: url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot');
-  src: url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff2') format('woff2'), url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff') format('woff'), url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg');
+  src: url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot');
+  src: url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff2') format('woff2'), url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff') format('woff'), url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg');
 }
 .glyphicon {
   position: relative;

themes/kwant/assets/css/theme.min.css

@@ -52,7 +52,7 @@ h2,h3{page-break-after:avoid}
 }
 .img-thumbnail,body{background-color:#fff}
 .btn,.btn-danger.active,.btn-danger:active,.btn-default.active,.btn-default:active,.btn-info.active,.btn-info:active,.btn-primary.active,.btn-primary:active,.btn-warning.active,.btn-warning:active,.btn.active,.btn:active,.dropdown-menu>.disabled>a:focus,.dropdown-menu>.disabled>a:hover,.form-control,.navbar-toggle,.open>.dropdown-toggle.btn-danger,.open>.dropdown-toggle.btn-default,.open>.dropdown-toggle.btn-info,.open>.dropdown-toggle.btn-primary,.open>.dropdown-toggle.btn-warning{background-image:none}
-@font-face{font-family:'Glyphicons Halflings';src:url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot);src:url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot?#iefix) format('embedded-opentype'),url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff2) format('woff2'),url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff) format('woff'),url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.ttf) format('truetype'),url(http://bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular) format('svg')}
+@font-face{font-family:'Glyphicons Halflings';src:url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot);src:url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.eot?#iefix) format('embedded-opentype'),url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff2) format('woff2'),url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.woff) format('woff'),url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.ttf) format('truetype'),url(//bootstrap-live-customizer.com/bootstrap-3.3.5/fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular) format('svg')}
 .glyphicon{position:relative;top:1px;display:inline-block;font-family:'Glyphicons Halflings';font-style:normal;font-weight:400;line-height:1;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
 .glyphicon-asterisk:before{content:"\2a"}
 .glyphicon-plus:before{content:"\2b"}
@@ -1440,4 +1440,4 @@ td.visible-print,th.visible-print{display:table-cell!important}
 .visible-print-inline-block{display:none!important}
 @media print{.visible-print-inline-block{display:inline-block!important}
 .hidden-print{display:none!important}
-}
\ No newline at end of file
+}