Restyle horizontal checkbox. Closes #2783.

rest_framework/static/rest_framework/css/bootstrap-tweaks.css

 /*
 
-This CSS file contains some tweaks specific to the included Bootstrap theme. 
+This CSS file contains some tweaks specific to the included Bootstrap theme.
 It's separate from `style.css` so that it can be easily overridden by replacing
 a single block in the template.
 
@@ -213,3 +213,17 @@ body a:hover {
 .request-info {
   clear:both;
 }
+
+.horizontal-checkbox label {
+  padding-top: 0;
+}
+
+.horizontal-checkbox label {
+  padding-top: 0 !important;
+}
+
+.horizontal-checkbox input {
+  float: left;
+  width: 20px;
+  margin-top: 3px;
+}

rest_framework/templates/rest_framework/horizontal/checkbox.html

-<div class="form-group {% if field.errors %}has-error{% endif %}">
-  <div class="col-sm-offset-2 col-sm-10">
-    <div class="checkbox">
-      <label>
-        <input type="checkbox" name="{{ field.name }}" value="true" {% if field.value %}checked{% endif %}>
-          {% if field.label %}{{ field.label }}{% endif %}
-      </label>
-    </div>
+<div class="form-group horizontal-checkbox {% if field.errors %}has-error{% endif %}">
+  {% if field.label %}
+    <label class="col-sm-2 control-label {% if style.hide_label %}sr-only{% endif %}">
+      {{ field.label }}
+    </label>
+  {% endif %}
+
+  <div class="col-sm-10">
+    <input type="checkbox" name="{{ field.name }}" value="true" {% if field.value %}checked{% endif %}>
 
     {% if field.errors %}
       {% for error in field.errors %}