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packages/theme-chalk/src/mixins/utils.scss

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+@mixin utils-user-select($value) {
+  -moz-user-select: $value;
+  -webkit-user-select: $value;
+  -ms-user-select: $value;
+}
+
+@mixin utils-clearfix {
+  $selector: &;
+
+  @at-root {
+    #{$selector}::before,
+    #{$selector}::after {
+      display: table;
+      content: "";
+    }
+    #{$selector}::after {
+      clear: both
+    }
+  }
+}
+
+@mixin utils-vertical-center {
+  $selector: &;
+
+  @at-root {
+    #{$selector}::after {
+      display: inline-block;
+      content: "";
+      height: 100%;
+      vertical-align: middle
+    }
+  }
+}
+
+@mixin utils-ellipsis {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}