Initial commit squashed

frontend/css/index.css

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+* {
+  box-sizing: border-box;
+}
+
+body {
+  font-family: Arial, Helvetica, sans-serif;
+}
+
+.modal-box {
+  display: none; /* Hidden by default */
+  position: fixed; /* Stay in place */
+  z-index: 1; /* Sit on top */
+  left: 0;
+  top: 0;
+  width: 100%; /* Full width */
+  height: 100%; /* Full height */
+  overflow: auto; /* Enable scroll if needed */
+  background-color: rgb(0,0,0); /* Fallback color */
+  background-color: rgba(0,0,0,0.8); /* Black w/ opacity */
+}
+
+.modal-box[popup-display="false"] {
+  display: none; /* Hidden by default */
+}
+
+.modal-box[popup-display="true"] {
+  display: flex; /* Hidden by default */
+}
+/* Modal Content/Box */
+.modal-content {
+  margin: 5% auto; /* 15% from the top and centered */
+  padding: 20px;
+  border: 1px solid #888;
+  width: 80%; /* Could be more or less, depending on screen size */
+  height: 90%;
+  overflow: auto; /* Enable scroll if needed */
+  background-color: #f1f1f1; /* Fallback color */
+}