Fixes #11990 and #12159: Make range inputs block level and 100% wide by default

dist/css/bootstrap.css

@@ -1651,6 +1651,10 @@ input[type="checkbox"] {
 input[type="file"] {
   display: block;
 }
+input[type="range"] {
+  display: block;
+  width: 100%;
+}
 select[multiple],
 select[size] {
   height: auto;

less/forms.less

@@ -52,6 +52,12 @@ input[type="file"] {
   display: block;
 }
 
+// Make range inputs behave like textual form controls
+input[type="range"] {
+  display: block;
+  width: 100%;
+}
+
 // Make multiple select elements height not fixed
 select[multiple],
 select[size] {