Switch to btn-check

scss/_button-group.scss

@@ -14,8 +14,8 @@
 
   // Bring the hover, focused, and "active" buttons to the front to overlay
   // the borders properly
-  > .btn-toggle:checked + .btn,
-  > .btn-toggle:focus + .btn,
+  > .btn-check:checked + .btn,
+  > .btn-check:focus + .btn,
   > .btn:hover,
   > .btn:focus,
   > .btn:active,
@@ -51,7 +51,7 @@
   // - Target second buttons which are not part of toggle buttons
   // - Target third or more child
   // - Target buttons in a button group
-  > :not(.btn-toggle) + .btn,
+  > :not(.btn-check) + .btn,
   > .btn:nth-child(n + 3),
   > .btn-group:not(:first-child) > .btn {
     @include border-left-radius(0);

scss/_buttons.scss

@@ -24,14 +24,14 @@
     text-decoration: if($link-hover-decoration == underline, none, null);
   }
 
-  .btn-toggle:focus + &,
+  .btn-check:focus + &,
   &:focus {
     outline: 0;
     box-shadow: $btn-focus-box-shadow;
   }
 
-  .btn-toggle:checked + &,
-  .btn-toggle:active + &,
+  .btn-check:checked + &,
+  .btn-check:active + &,
   &:active,
   &.active {
     @include box-shadow($btn-active-box-shadow);

scss/forms/_form-check.scss

@@ -135,7 +135,7 @@
   margin-right: $form-check-inline-margin-right;
 }
 
-.btn-toggle {
+.btn-check {
   position: absolute;
   clip: rect(0, 0, 0, 0);
   pointer-events: none;

scss/mixins/_buttons.scss

@@ -25,7 +25,7 @@
     border-color: $hover-border;
   }
 
-  .btn-toggle:focus + &,
+  .btn-check:focus + &,
   &:focus {
     color: $hover-color;
     @include gradient-bg($hover-background);
@@ -38,8 +38,8 @@
     }
   }
 
-  .btn-toggle:checked + &,
-  .btn-toggle:active + &,
+  .btn-check:checked + &,
+  .btn-check:active + &,
   &:active,
   &.active,
   .show > &.dropdown-toggle {
@@ -85,13 +85,13 @@
     border-color: $active-border;
   }
 
-  .btn-toggle:focus + &,
+  .btn-check:focus + &,
   &:focus {
     box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
   }
 
-  .btn-toggle:checked + &,
-  .btn-toggle:active + &,
+  .btn-check:checked + &,
+  .btn-check:active + &,
   &:active,
   &.active,
   &.dropdown-toggle.show {