make active tab to jut out slightly to indicate that it's active (inspired by winMe)

src/components/roundness_input/roundness_input.vue

@@ -0,0 +1,51 @@
+<template>
+  <div
+    class="roundness-control style-control"
+    :class="{ disabled: !present || disabled }"
+  >
+    <label
+      :for="name"
+      class="label"
+      :class="{ faint: !present || disabled }"
+    >
+      {{ label }}
+    </label>
+    <Checkbox
+      v-if="typeof fallback !== 'undefined'"
+      :model-value="present"
+      :disabled="disabled"
+      class="opt"
+      @update:modelValue="$emit('update:modelValue', !present ? fallback : undefined)"
+    />
+    <input
+      :id="name"
+      class="input input-number"
+      type="number"
+      :value="modelValue || fallback"
+      :disabled="!present || disabled"
+      :class="{ disabled: !present || disabled }"
+      max="999"
+      min="0"
+      step="1"
+      @input="$emit('update:modelValue', $event.target.value)"
+    >
+  </div>
+</template>
+
+<script>
+import Checkbox from '../checkbox/checkbox.vue'
+export default {
+  components: {
+    Checkbox
+  },
+  props: [
+    'name', 'label', 'modelValue', 'fallback', 'disabled'
+  ],
+  emits: ['update:modelValue'],
+  computed: {
+    present () {
+      return typeof this.modelValue !== 'undefined'
+    }
+  }
+}
+</script>