[#392] Added missing box sizing border-box to missing components.

- Fix subject card box-sizing.
- Fix input box-sizing.
- Fix navigation card box-sizing.
- Fix campaign image box-sizing.
- Fix iframe with background box-sizing.

components/00-base/mixins/_image.scss

@@ -62,6 +62,7 @@
   position: relative;
   width: 100%;
   padding-top: 100%;
+  box-sizing: border-box;
 
   img {
     position: absolute;

components/01-atoms/iframe/iframe.scss

@@ -6,6 +6,7 @@
   $root: &;
 
   border: 0;
+  box-sizing: border-box;
 
   &#{$root}--with-background {
     padding-left: $ct-iframe-space-horizontal;

components/01-atoms/input/input.scss

@@ -23,6 +23,7 @@
     border-style: solid;
     border-width: $_border-width;
     padding: $_vertical_spacing $_horizontal_spacing;
+    box-sizing: border-box;
     width: 100%;
   }
 

components/02-molecules/navigation-card/navigation-card.scss

@@ -45,6 +45,7 @@
   #{$root}__content {
     width: 100%;
     padding: ct-spacing(3);
+    box-sizing: border-box;
   }
 
   #{$root}__icon {

components/02-molecules/subject-card/subject-card.scss

@@ -24,6 +24,7 @@
       min-height: $ct-subject-card-image-height-mobile;
       min-width: $ct-subject-card-image-width-mobile;
       padding: ct-spacing(2);
+      box-sizing: border-box;
     }
 
     @include ct-breakpoint(m) {