Перенес стили в отдельный файл

popup.css

@@ -0,0 +1,94 @@
+body {
+    min-width: 80px;
+}
+/* The switch - the box around the slider */
+.switch {
+    position: relative;
+    display: inline-block;
+    width: 60px;
+    height: 34px;
+}
+
+/* Hide default HTML checkbox */
+.switch input {
+    opacity: 0;
+    width: 0;
+    height: 0;
+}
+
+/* The slider */
+.slider {
+    position: absolute;
+    cursor: pointer;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background-color: #ccc;
+    -webkit-transition: .4s;
+    transition: .4s;
+}
+
+.slider:before {
+    position: absolute;
+    content: "";
+    height: 26px;
+    width: 26px;
+    left: 4px;
+    bottom: 4px;
+    background-color: white;
+    -webkit-transition: .4s;
+    transition: .4s;
+}
+
+input:checked + .slider {
+    background-color: #2196F3;
+}
+
+input:focus + .slider {
+    box-shadow: 0 0 1px #2196F3;
+}
+
+input:checked + .slider:before {
+    -webkit-transform: translateX(26px);
+    -ms-transform: translateX(26px);
+    transform: translateX(26px);
+}
+
+/* Rounded sliders */
+.slider.round {
+    border-radius: 34px;
+}
+
+.slider.round:before {
+    border-radius: 50%;
+}
+
+.header {
+    background-color: #2196F3;
+    color: white;
+    width: 100vw;
+    position: relative;
+    margin-left: -50vw;
+    left: 50%;
+    margin-top: -20vw;
+    margin-bottom: 10vw;
+    padding-top: 5px;
+    padding-bottom: 5px;
+}
+
+#idToHide {
+    margin: 10px;
+}
+
+.id_list {
+    background-color: #dcdfde;
+    color: black;
+    width: 100vw;
+    position: relative;
+    margin-left: -50vw;
+    left: 50%;
+    margin-top: 10vw;
+    padding-top: 5px;
+    padding-bottom: 5px;
+}