Add responsive and lazy image loading

src/lib/styles/base.css

@@ -0,0 +1,34 @@
+:root {
+  --main-text-color: #1a1a1a;
+  --main-bg-color: #fff;
+}
+
+@media screen and (prefers-color-scheme: dark) {
+  :root {
+    --main-text-color: #e7e7e7;
+    --main-bg-color: #1a1a1a;
+  }
+}
+
+* {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  box-sizing: border-box;
+  font-size: 1em;
+  font-family: 'Roboto', 'Open Sans', sans-serif;
+}
+
+html,
+body,
+.container,
+.footer {
+  width: 100%;
+  max-width: 100%;
+}
+
+body {
+  font-family: sans-serif;
+  background-color: var(--main-bg-color);
+  color: var(--main-text-color);
+}