add nsfw warning dialog

style/shiny/nsfw-warning.css

@@ -0,0 +1,78 @@
+.dialog {
+  position: fixed;
+  top: 0; left: 0;
+  width: 100vw; height: 100vh;
+  margin: 0;
+  z-index: 1000;
+
+  background: hsl(340deg, 35%, 15%, 90%);
+  backdrop-filter: blur(15px);
+  color: var(--text-col);
+  display: grid;
+}
+
+.dialog-inner {
+  place-self: center;
+
+  display: grid;
+  grid-template:
+    "header  header"
+    "icon    text"
+    "buttons buttons"
+    / 1fr 3fr;
+  grid-gap: 0.5em;
+  align-items: center;
+
+  min-height: 20vh;
+  max-width: 60vw;
+  padding: 1.5em 3em 2em;
+
+  background: var(--background);
+  border: var(--border);
+  border-radius: var(--border-radius);
+}
+
+.dialog h1 {
+  margin: 0;
+  grid-area: header;
+  justify-self: center;
+}
+
+.dialog-icon {
+  height: 3em;
+  width: 3em;
+  grid-area: icon;
+  justify-self: center;
+}
+
+.dialog-message {
+  grid-area: text;
+  justify-self: start;
+}
+
+.dialog-buttons {
+  grid-area: buttons;
+  justify-self: center;
+}
+
+.dialog button + button {
+  margin-left: 1em;
+}
+
+.dialog button {
+  border: none;
+  border-radius: 0.75em;
+  padding: 0.5em 1em;
+
+  font-family: Muller;
+  font-weight: 600;
+  color: black;
+}
+
+button.yes {
+  background: hsl(100deg, 70%, 80%);
+}
+
+button.no {
+  background: hsl(5deg, 70%, 80%);
+}