diff --git a/app/assets/stylesheets/bootstrap.css b/app/assets/stylesheets/bootstrap.css
index b0541219a..0e569dc1d 100644
--- a/app/assets/stylesheets/bootstrap.css
+++ b/app/assets/stylesheets/bootstrap.css
@@ -2086,389 +2086,6 @@ select[multiple].form-group-lg .form-control {
     padding-top: 6px;
   }
 }
-.btn {
-  display: inline-block;
-  padding: 6px 12px;
-  margin-bottom: 0;
-  font-size: 14px;
-  font-weight: normal;
-  line-height: 1.42857143;
-  text-align: center;
-  white-space: nowrap;
-  vertical-align: middle;
-  -ms-touch-action: manipulation;
-      touch-action: manipulation;
-  cursor: pointer;
-  -webkit-user-select: none;
-     -moz-user-select: none;
-      -ms-user-select: none;
-          user-select: none;
-  background-image: none;
-  border: 1px solid transparent;
-  border-radius: 4px;
-}
-.btn:focus,
-.btn:active:focus,
-.btn.active:focus,
-.btn.focus,
-.btn:active.focus,
-.btn.active.focus {
-  outline: thin dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-  outline-offset: -2px;
-}
-.btn:hover,
-.btn:focus,
-.btn.focus {
-  color: #333;
-  text-decoration: none;
-}
-.btn.disabled,
-.btn[disabled],
-fieldset[disabled] .btn {
-  pointer-events: none;
-  cursor: not-allowed;
-  filter: alpha(opacity=65);
-  -webkit-box-shadow: none;
-          box-shadow: none;
-  opacity: .65;
-}
-.btn-default {
-  color: #333;
-  background-color: #fff;
-  border-color: #ccc;
-}
-.btn-default:hover,
-.btn-default:focus,
-.btn-default.focus,
-.btn-default:active,
-.btn-default.active,
-.open > .dropdown-toggle.btn-default {
-  color: #333;
-  background-color: #e6e6e6;
-  border-color: #adadad;
-}
-.btn-default:active,
-.btn-default.active,
-.open > .dropdown-toggle.btn-default {
-  background-image: none;
-}
-.btn-default.disabled,
-.btn-default[disabled],
-fieldset[disabled] .btn-default,
-.btn-default.disabled:hover,
-.btn-default[disabled]:hover,
-fieldset[disabled] .btn-default:hover,
-.btn-default.disabled:focus,
-.btn-default[disabled]:focus,
-fieldset[disabled] .btn-default:focus,
-.btn-default.disabled.focus,
-.btn-default[disabled].focus,
-fieldset[disabled] .btn-default.focus,
-.btn-default.disabled:active,
-.btn-default[disabled]:active,
-fieldset[disabled] .btn-default:active,
-.btn-default.disabled.active,
-.btn-default[disabled].active,
-fieldset[disabled] .btn-default.active {
-  background-color: #fff;
-  border-color: #ccc;
-}
-.btn-default .badge {
-  color: #fff;
-  background-color: #333;
-}
-.btn-primary {
-  color: #fff;
-  background-color: #337ab7;
-  border-color: #2e6da4;
-}
-.btn-primary:hover,
-.btn-primary:focus,
-.btn-primary.focus,
-.btn-primary:active,
-.btn-primary.active,
-.open > .dropdown-toggle.btn-primary {
-  color: #fff;
-  background-color: #286090;
-  border-color: #204d74;
-}
-.btn-primary:active,
-.btn-primary.active,
-.open > .dropdown-toggle.btn-primary {
-  background-image: none;
-}
-.btn-primary.disabled,
-.btn-primary[disabled],
-fieldset[disabled] .btn-primary,
-.btn-primary.disabled:hover,
-.btn-primary[disabled]:hover,
-fieldset[disabled] .btn-primary:hover,
-.btn-primary.disabled:focus,
-.btn-primary[disabled]:focus,
-fieldset[disabled] .btn-primary:focus,
-.btn-primary.disabled.focus,
-.btn-primary[disabled].focus,
-fieldset[disabled] .btn-primary.focus,
-.btn-primary.disabled:active,
-.btn-primary[disabled]:active,
-fieldset[disabled] .btn-primary:active,
-.btn-primary.disabled.active,
-.btn-primary[disabled].active,
-fieldset[disabled] .btn-primary.active {
-  background-color: #337ab7;
-  border-color: #2e6da4;
-}
-.btn-primary .badge {
-  color: #337ab7;
-  background-color: #fff;
-}
-.btn-success {
-  color: #fff;
-  background-color: #5cb85c;
-  border-color: #4cae4c;
-}
-.btn-success:hover,
-.btn-success:focus,
-.btn-success.focus,
-.btn-success:active,
-.btn-success.active,
-.open > .dropdown-toggle.btn-success {
-  color: #fff;
-  background-color: #449d44;
-  border-color: #398439;
-}
-.btn-success:active,
-.btn-success.active,
-.open > .dropdown-toggle.btn-success {
-  background-image: none;
-}
-.btn-success.disabled,
-.btn-success[disabled],
-fieldset[disabled] .btn-success,
-.btn-success.disabled:hover,
-.btn-success[disabled]:hover,
-fieldset[disabled] .btn-success:hover,
-.btn-success.disabled:focus,
-.btn-success[disabled]:focus,
-fieldset[disabled] .btn-success:focus,
-.btn-success.disabled.focus,
-.btn-success[disabled].focus,
-fieldset[disabled] .btn-success.focus,
-.btn-success.disabled:active,
-.btn-success[disabled]:active,
-fieldset[disabled] .btn-success:active,
-.btn-success.disabled.active,
-.btn-success[disabled].active,
-fieldset[disabled] .btn-success.active {
-  background-color: #5cb85c;
-  border-color: #4cae4c;
-}
-.btn-success .badge {
-  color: #5cb85c;
-  background-color: #fff;
-}
-.btn-info {
-  color: #fff;
-  background-color: #5bc0de;
-  border-color: #46b8da;
-}
-.btn-info:hover,
-.btn-info:focus,
-.btn-info.focus,
-.btn-info:active,
-.btn-info.active,
-.open > .dropdown-toggle.btn-info {
-  color: #fff;
-  background-color: #31b0d5;
-  border-color: #269abc;
-}
-.btn-info:active,
-.btn-info.active,
-.open > .dropdown-toggle.btn-info {
-  background-image: none;
-}
-.btn-info.disabled,
-.btn-info[disabled],
-fieldset[disabled] .btn-info,
-.btn-info.disabled:hover,
-.btn-info[disabled]:hover,
-fieldset[disabled] .btn-info:hover,
-.btn-info.disabled:focus,
-.btn-info[disabled]:focus,
-fieldset[disabled] .btn-info:focus,
-.btn-info.disabled.focus,
-.btn-info[disabled].focus,
-fieldset[disabled] .btn-info.focus,
-.btn-info.disabled:active,
-.btn-info[disabled]:active,
-fieldset[disabled] .btn-info:active,
-.btn-info.disabled.active,
-.btn-info[disabled].active,
-fieldset[disabled] .btn-info.active {
-  background-color: #5bc0de;
-  border-color: #46b8da;
-}
-.btn-info .badge {
-  color: #5bc0de;
-  background-color: #fff;
-}
-.btn-warning {
-  color: #fff;
-  background-color: #f0ad4e;
-  border-color: #eea236;
-}
-.btn-warning:hover,
-.btn-warning:focus,
-.btn-warning.focus,
-.btn-warning:active,
-.btn-warning.active,
-.open > .dropdown-toggle.btn-warning {
-  color: #fff;
-  background-color: #ec971f;
-  border-color: #d58512;
-}
-.btn-warning:active,
-.btn-warning.active,
-.open > .dropdown-toggle.btn-warning {
-  background-image: none;
-}
-.btn-warning.disabled,
-.btn-warning[disabled],
-fieldset[disabled] .btn-warning,
-.btn-warning.disabled:hover,
-.btn-warning[disabled]:hover,
-fieldset[disabled] .btn-warning:hover,
-.btn-warning.disabled:focus,
-.btn-warning[disabled]:focus,
-fieldset[disabled] .btn-warning:focus,
-.btn-warning.disabled.focus,
-.btn-warning[disabled].focus,
-fieldset[disabled] .btn-warning.focus,
-.btn-warning.disabled:active,
-.btn-warning[disabled]:active,
-fieldset[disabled] .btn-warning:active,
-.btn-warning.disabled.active,
-.btn-warning[disabled].active,
-fieldset[disabled] .btn-warning.active {
-  background-color: #f0ad4e;
-  border-color: #eea236;
-}
-.btn-warning .badge {
-  color: #f0ad4e;
-  background-color: #fff;
-}
-.btn-danger {
-  color: #fff;
-  background-color: #d9534f;
-  border-color: #d43f3a;
-}
-.btn-danger:hover,
-.btn-danger:focus,
-.btn-danger.focus,
-.btn-danger:active,
-.btn-danger.active,
-.open > .dropdown-toggle.btn-danger {
-  color: #fff;
-  background-color: #c9302c;
-  border-color: #ac2925;
-}
-.btn-danger:active,
-.btn-danger.active,
-.open > .dropdown-toggle.btn-danger {
-  background-image: none;
-}
-.btn-danger.disabled,
-.btn-danger[disabled],
-fieldset[disabled] .btn-danger,
-.btn-danger.disabled:hover,
-.btn-danger[disabled]:hover,
-fieldset[disabled] .btn-danger:hover,
-.btn-danger.disabled:focus,
-.btn-danger[disabled]:focus,
-fieldset[disabled] .btn-danger:focus,
-.btn-danger.disabled.focus,
-.btn-danger[disabled].focus,
-fieldset[disabled] .btn-danger.focus,
-.btn-danger.disabled:active,
-.btn-danger[disabled]:active,
-fieldset[disabled] .btn-danger:active,
-.btn-danger.disabled.active,
-.btn-danger[disabled].active,
-fieldset[disabled] .btn-danger.active {
-  background-color: #d9534f;
-  border-color: #d43f3a;
-}
-.btn-danger .badge {
-  color: #d9534f;
-  background-color: #fff;
-}
-.btn-link {
-  font-weight: normal;
-  color: #337ab7;
-  border-radius: 0;
-}
-.btn-link,
-.btn-link:active,
-.btn-link.active,
-.btn-link[disabled],
-fieldset[disabled] .btn-link {
-  background-color: transparent;
-  -webkit-box-shadow: none;
-          box-shadow: none;
-}
-.btn-link,
-.btn-link:hover,
-.btn-link:focus,
-.btn-link:active {
-  border-color: transparent;
-}
-.btn-link:hover,
-.btn-link:focus {
-  color: #23527c;
-  text-decoration: underline;
-  background-color: transparent;
-}
-.btn-link[disabled]:hover,
-fieldset[disabled] .btn-link:hover,
-.btn-link[disabled]:focus,
-fieldset[disabled] .btn-link:focus {
-  color: #777;
-  text-decoration: none;
-}
-.btn-lg,
-.btn-group-lg > .btn {
-  padding: 10px 16px;
-  font-size: 18px;
-  line-height: 1.33;
-  border-radius: 6px;
-}
-.btn-sm,
-.btn-group-sm > .btn {
-  padding: 5px 10px;
-  font-size: 12px;
-  line-height: 1.5;
-  border-radius: 3px;
-}
-.btn-xs,
-.btn-group-xs > .btn {
-  padding: 1px 5px;
-  font-size: 12px;
-  line-height: 1.5;
-  border-radius: 3px;
-}
-.btn-block {
-  display: block;
-  width: 100%;
-}
-.btn-block + .btn-block {
-  margin-top: 5px;
-}
-input[type="submit"].btn-block,
-input[type="reset"].btn-block,
-input[type="button"].btn-block {
-  width: 100%;
-}
 .fade {
   opacity: 0;
   -webkit-transition: opacity .15s linear;
diff --git a/app/assets/stylesheets/zammad.css.scss b/app/assets/stylesheets/zammad.css.scss
index 38664e42a..ebde54b1c 100644
--- a/app/assets/stylesheets/zammad.css.scss
+++ b/app/assets/stylesheets/zammad.css.scss
@@ -264,15 +264,26 @@ span[data-tooltip]:hover:before {
   color: hsl(0,0%,80%);
 }
 
-.btn,
-.btn:hover,
-.btn:focus {
+.btn {
+  display: inline-block;
   font-size: 14px;
   padding: 10px 24px 9px;
   color: hsl(202,68%,54%);
   background: white;
   border-color: rgba(0,0,0,.1);
   outline: none !important;
+  touch-action: manipulation;
+  user-select: none;
+  cursor: pointer;
+  border: 1px solid transparent;
+  border-radius: 4px;
+  text-align: center;
+  white-space: nowrap;
+  vertical-align: middle;
+  
+  &:focus {
+    box-shadow: 0 0 0 3px hsl(201,62%,90%);
+  }
   
   &.btn--slim {
     padding-left: 12px;