init

uni_modules/nutui-uni/components/backtop/index.scss

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+.nut-theme-dark {
+  .nut-backtop {
+    &.show {
+      color: $dark-color;
+      background: $dark-background;
+      border: 1px solid $dark-background;
+    }
+
+    &-main {
+      color:'#ffffff';
+    }
+  }
+}
+
+.nut-backtop {
+  position: fixed;
+  display: none;
+
+  &.show {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 40px;
+    height: 40px;
+    background: $white;
+    border: 1px solid $backtop-border-color;
+    border-radius: 50%;
+  }
+
+  &.show :active {
+    background: rgb(0 0 0 / 10%);
+  }
+
+  &-main {
+    color:'#000000';
+    transition: all 0.2s ease-in-out
+  }
+}
+
+