diff --git a/docs/v3/DEVLOG.md b/docs/v3/DEVLOG.md
index e005ff3..01e6dd2 100644
--- a/docs/v3/DEVLOG.md
+++ b/docs/v3/DEVLOG.md
@@ -132,10 +132,13 @@
 - Renamed `grid` to `layout`. It will now house the `card` module, too. This is done to make sure that cards are never used without the grid system, as they wouldn't work too well without it.
 - Fully implemented the `card` module into `layout`, gave me no trouble. It's fully operational and tested. Some color tweaking might be required, but everything is pretty much ready for deployment in the `layout` module.
 - Customized `checkbox` and `radio` input elements, they should work pretty much fine.
-- *TODO* Add all missing values to modules much like I have done in `layout` module.
 
 ## 20171112
 
 - Updated `navigation` module to use Unicode symbols instead of icons. This will allow for more customization of the icons used in terms of color and alignment.
 - Modularized colorization of `form` and `input` elements, everything should now work fine by itself.
-- *TODO* Add button groups, deal with `checkbox` and `radio` sizing in a proper manner.
+
+## 20171113
+
+- Properly applied variable styling to `checkbox` and `radio` elements. They now use the `base-font-size` Sass variable to get their size, which makes sense.
+- Added `.button-group`s, they seem to behave properly, `border-color` could use some tweaking maybe.
diff --git a/docs/v3_dev/src/index.css b/docs/v3_dev/src/index.css
index 6d17dde..a26831d 100644
--- a/docs/v3_dev/src/index.css
+++ b/docs/v3_dev/src/index.css
@@ -659,6 +659,7 @@ a:hover, a:focus {
   --button-fore-color: #212121;
   --button-border-color: transparent;
   --button-hover-border-color: transparent;
+  --button-group-border-color: rgba(124, 124, 124, 0.54);
 }
 
 form {
@@ -780,7 +781,7 @@ option {
   width: calc(1rem + var(--universal-padding) / 2);
   vertical-align: text-bottom;
   padding: 0;
-  flex-basis: 1.25rem !important;
+  flex-basis: calc(1rem + var(--universal-padding) / 2) !important;
   flex-grow: 0 !important;
 }
 
@@ -862,6 +863,37 @@ input:disabled, input[disabled], textarea:disabled, textarea[disabled], select:d
   opacity: 0.75;
 }
 
+.button-group {
+  display: flex;
+  border: 0.0625rem solid var(--button-group-border-color);
+  border-radius: var(--universal-border-radius);
+  margin: var(--universal-margin);
+}
+
+.button-group > button, .button-group [type="button"], .button-group > [type="submit"], .button-group > [type="reset"],
+.button-group > .button, .button-group > [role="button"] {
+  margin: 0;
+  flex: 1 1 auto;
+  text-align: center;
+  border: 0;
+  border-radius: 0;
+  box-shadow: none;
+}
+
+.button-group > :not(:first-child) {
+  border-left: 0.0625rem solid var(--button-group-border-color);
+}
+
+@media screen and (max-width: 767px) {
+  .button-group {
+    flex-direction: column;
+  }
+  .button-group > :not(:first-child) {
+    border: 0;
+    border-top: 0.0625rem solid var(--button-group-border-color);
+  }
+}
+
 /*
   Definitions for navigation elements.
 */
diff --git a/src/mini/_input_control.scss b/src/mini/_input_control.scss
index 805b2d3..2101513 100644
--- a/src/mini/_input_control.scss
+++ b/src/mini/_input_control.scss
@@ -9,6 +9,8 @@ $input-group-vertical-name:  'vertical' !default;     // Class name for vertical
 $input-group-mobile-breakpoint:   767px !default;     // Breakpoint for fluid input group mobile view.
 $button-class-name:           'button' !default;      // Class name for elements styled as buttons.
 $input-disabled-opacity:      0.75 !default;          // Opacity for input elements when disabled.
+$button-group-name:         'button-group' !default;  // Class name for button groups.
+$button-group-mobile-breakpoint: 767px !default;      // Mobile breakpoint for button groups.
 $form-back-color:             #f0f0f0 !default;       // Background color for forms.
 $form-fore-color:             #111 !default;          // Text color for forms.
 $form-border-color:           #ddd !default;          // Border color for forms.
@@ -22,6 +24,7 @@ $button-hover-back-color:     #dcdcdc !default;       // Background color for bu
 $button-fore-color:           #212121 !default;       // Text color for buttons.
 $button-border-color:         transparent !default;   // Border color for buttons.
 $button-hover-border-color:   transparent !default;   // Border color for buttons (hover).
+$button-group-border-color:  rgba(124,124,124, 0.54) !default;  // Border color for button groups.
 // CSS variable name definitions [exercise caution if modifying these]
 $form-back-color-var:         '--form-back-color' !default;
 $form-fore-color-var:         '--form-fore-color' !default;
@@ -37,6 +40,7 @@ $button-fore-color-var:       '--button-fore-color' !default;
 $button-hover-fore-color-var: '--button-hover-fore-color' !default;
 $button-border-color-var:       '--button-border-color' !default;
 $button-hover-border-color-var: '--button-hover-border-color' !default;
+$button-group-border-color-var: '--button-group-border-color' !default;
 // Check the `_input_control_mixins.scss` file to find this module's mixins.
 @import 'input_control_mixins';
 /* Input_control module CSS variable definitions */
@@ -54,6 +58,7 @@ $button-hover-border-color-var: '--button-hover-border-color' !default;
   #{$button-fore-color-var}: $button-fore-color;
   #{$button-border-color-var}: $button-border-color;
   #{$button-hover-border-color-var}: $button-hover-border-color;
+  #{$button-group-border-color-var}: $button-group-border-color;
 }
 // Base form styling
 form {  // Text color is the default, this can be changed manually.
@@ -175,11 +180,11 @@ option {
   -moz-appearance: none;
   appearance: none;
   position: relative;
-  height: calc(1rem + var(#{$universal-padding-var}) / 2);
-  width: calc(1rem + var(#{$universal-padding-var}) / 2);
+  height: calc(#{$base-font-size} + var(#{$universal-padding-var}) / 2);
+  width: calc(#{$base-font-size} + var(#{$universal-padding-var}) / 2);
   vertical-align: text-bottom;
   padding: 0; // Remove padding added from previous styles.
-  flex-basis: 1.25rem !important; // Override fluid input-group styling.
+  flex-basis: calc(#{$base-font-size} + var(#{$universal-padding-var}) / 2) !important; // Override fluid input-group styling.
   flex-grow: 0 !important;  // Using with fluid input-groups is not recommended.
   &:checked:before {
     position: absolute;
@@ -189,7 +194,7 @@ option {
   &:checked:before {
     content: '\2713';
     font-family: sans-serif;
-    font-size: calc(1rem + var(#{$universal-padding-var}) / 2);
+    font-size: calc(#{$base-font-size} + var(#{$universal-padding-var}) / 2);
     top: calc(0rem - var(#{$universal-padding-var}));
     left: calc(var(#{$universal-padding-var}) / 4);
   }
@@ -257,3 +262,33 @@ input, textarea, select, button, .#{$button-class-name}, [role="button"] {
     opacity: $input-disabled-opacity;
   }
 }
+// Button group styling.
+.#{$button-group-name} {
+  display: flex;
+  border: $__1px solid var(#{$button-group-border-color-var});
+  border-radius: var(#{$universal-border-radius-var});
+  margin: var(#{$universal-margin-var});
+  @if $universal-box-shadow != none {
+    box-shadow: var(#{$universal-box-shadow-var});
+  }
+  & > button, [type="button"], & > [type="submit"], & > [type="reset"],
+  & > .#{$button-class-name}, & > [role="button"] {
+    margin: 0;
+    flex: 1 1 auto;
+    text-align: center;
+    border: 0;
+    border-radius: 0;
+    box-shadow: none;
+  }
+  & > :not(:first-child) {
+    border-left: $__1px solid var(#{$button-group-border-color-var});
+  }
+  // Responsiveness for button groups
+  @media screen and (max-width: #{$button-group-mobile-breakpoint}) {
+    flex-direction: column;
+    & > :not(:first-child) {
+      border: 0;    // Reapply to remove the left border from elements.
+      border-top: $__1px solid var(#{$button-group-border-color-var});
+    }
+  }
+}