Elastic: Fix various small css issues

skins/elastic/styles/colors.less

@@ -138,7 +138,7 @@
 
 // Forms
 @color-input:                       @color-font;
-@color-input-border:                rgba(22, 27, 29, 0.15);
+@color-input-border:                #ced4da; // from Bootstrap's .form-control
 @color-input-border-focus:          @color-main;
 @color-input-border-focus-shadow:   fadeout(@color-main, 75);
 @color-input-border-invalid:        @color-error;

skins/elastic/styles/widgets/dialogs.less

@@ -23,7 +23,6 @@
 
     &.propform {
         overflow: hidden;
-        margin-top: 1rem;
         padding: .25rem; // so overflow do not truncate focus outline on inputs
     }
 

skins/elastic/styles/widgets/forms.less

@@ -786,6 +786,7 @@ html.touch .popupmenu.form {
 
     input.form-control {
         padding-left: .75rem;
+        height: auto; // fixes input height
     }
 
     input,