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assets/webapps/system.gaiamobile.org/style/sleep_menu/sleep_menu.css

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+#sleep-menu {
+  display: none;
+  position: absolute;
+}
+
+#sleep-menu.visible {
+  display: flex;
+}
+
+@media (min-width: 768px) {
+  #sleep-menu {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    box-sizing: border-box;
+    background-color: rgba(0,0,0,0.6);
+  }
+
+  #sleep-menu-container {
+    position: absolute;
+    top: calc(50% - 24.5rem);
+    offset-inline-start: calc(50% - 34rem);
+    width: 68rem;
+    height: 49rem;
+    padding: 0;
+    font-size: 2.2rem;
+    background-color: #333333;
+    box-shadow: 0 0 1rem #222222;
+    border: 0.1rem solid #282828;
+  }
+
+  #sleep-menu-container section {
+    top: 7rem;
+    bottom: 10rem;
+    margin: 0 6rem;
+  }
+
+  #sleep-menu-container li {
+    box-sizing: border-box;
+    border: 0.1rem #a8a8a8;
+    height: 4.7rem;
+    font-size: 2.3rem;
+    line-height: 3rem;
+    font-weight: 400;
+    margin: 0 1.5rem 2.4rem;
+    padding: 1rem 5rem;
+  }
+
+  #sleep-menu-container li:before {
+    background-color: #898989;
+  }
+
+  #sleep-menu-container li:active:before {
+    background-color: #00aacc;
+  }
+
+  #sleep-menu-container li:after {
+    display: none;
+  }
+
+  #sleep-menu-container li:first-child {
+    margin-top: 3rem;
+  }
+
+  #sleep-menu-container ul [data-value] {
+    background-size: 4rem;
+    background-repeat: no-repeat;
+  }
+  html[dir="ltr"] #sleep-menu-container ul [data-value] {
+    background-position: left center;
+  }
+  html[dir="rtl"] #sleep-menu-container ul [data-value] {
+    background-position: right center;
+  }
+
+  #sleep-menu-container ul [data-value="airplane"],
+  #sleep-menu-container ul [data-value="airplaneOff"] {
+    background-image: url(/style/sleep_menu/images/airplane.png);
+  }
+
+  #sleep-menu-container ul [data-value="silentOff"],
+  #sleep-menu-container ul [data-value="silent"] {
+    background-image: url(/style/sleep_menu/images/vibration.png);
+  }
+
+  #sleep-menu-container ul [data-value="restart"] {
+    background-image: url(/style/sleep_menu/images/restart.png);
+  }
+
+  #sleep-menu-container ul [data-value="power"] {
+    background-image: url(/style/sleep_menu/images/power-off.png);
+  }
+}