Add Spring Boot Twitch overlay server with CI and Docker

src/main/resources/static/css/styles.css

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+body {
+    font-family: Arial, sans-serif;
+    background: #0f172a;
+    color: #e2e8f0;
+    margin: 0;
+    padding: 0;
+}
+
+.container {
+    max-width: 960px;
+    margin: 40px auto;
+    background: #111827;
+    padding: 24px;
+    border-radius: 12px;
+    box-shadow: 0 5px 16px rgba(0,0,0,0.3);
+}
+
+.button, button {
+    background: #7c3aed;
+    color: white;
+    padding: 10px 16px;
+    border: none;
+    border-radius: 8px;
+    cursor: pointer;
+    text-decoration: none;
+}
+
+.secondary {
+    background: #475569;
+}
+
+.admin-layout header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 16px;
+}
+
+.controls {
+    display: flex;
+    gap: 24px;
+    padding: 16px;
+    background: #0b1220;
+}
+
+.controls ul {
+    list-style: none;
+    padding: 0;
+    margin-top: 12px;
+}
+
+.controls li {
+    margin: 6px 0;
+}
+
+.overlay {
+    position: relative;
+    height: 600px;
+    background: black;
+}
+
+.overlay iframe {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    border: none;
+}
+
+.overlay canvas, .broadcast-body canvas {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+}
+
+.broadcast-body {
+    margin: 0;
+    overflow: hidden;
+    background: transparent;
+}