Frontend app directory structure

app/styles/app.css

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+section {
+    float: left;
+}
+
+.app {
+    width: 100%;
+}
+
+.menu {
+    width: 13em;
+}
+.menu ul {
+    margin: 0;
+    padding: 0;
+}
+li.nav {
+    display: block;
+    line-height: 2.5em;
+    padding: 0 1em;
+    cursor: pointer;
+}
+.nav.empact {
+    font-weight: 600;
+}
+.nav.header {
+    color: #aaa;
+    cursor: default;
+}
+
+.content {
+    width: calc(100% - 13em);
+}
+.content .left, .content .right {
+    float: left;
+    width: 50%;
+}

app/styles/hello.css

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+* {
+    box-sizing: border-box;
+    font-family: 'Helvetica Neue', Helvetica, sans-serif;
+    font-weight: 400;
+}
+html, body {
+    margin: 0;
+    padding: 0;
+}
+
+h1 {
+    position: absolute;
+    left: 15%;
+    top: 20%;
+    width: 70%;
+    text-align: center;
+    color: #aaa;
+}
+
+a {
+    position: absolute;
+    top: 40%;
+    width: 100%;
+    text-align: center;
+}
+
+img {
+    width: 60px;
+}