feat: Headerを作成

src/App.tsx

@@ -1,24 +1,11 @@
 import React from "react";
-import logo from "./assets/images/logo.svg";
-import "./assets/styles/App.css";
+import Header from "./components/Header";
+import "./assets/styles/reset.css";
 
 function App() {
   return (
-    <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.tsx</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
+    <div className="layout">
+      <Header />
     </div>
   );
 }

src/assets/styles/Header.css

@@ -0,0 +1,34 @@
+.wrapper {
+  max-width: 1140px;
+  padding-left: 1rem;
+  padding-right: 1rem;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.brand {
+  font-weight: bold;
+  font-size: 20px;
+  text-decoration: none;
+  color: #222;
+  padding: 1.5rem 1rem;
+}
+
+.site-header {
+  position: relative;
+  background-color: #def7ff;
+}
+
+.site-header__wrapper {
+  padding-top: 1rem;
+  padding-bottom: 1rem;
+}
+@media (min-width: 600px) {
+  .site-header__wrapper {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding-top: 0;
+    padding-bottom: 0;
+  }
+}

src/assets/styles/index.css

@@ -6,8 +6,3 @@ body {
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
-    monospace;
-}

src/assets/styles/reset.css

@@ -0,0 +1,129 @@
+/* http://meyerweb.com/eric/tools/css/reset/ 
+   v2.0 | 20110126
+   License: none (public domain)
+*/
+
+html,
+body,
+div,
+span,
+applet,
+object,
+iframe,
+h1,
+h2,
+h3,
+h4,
+h5,
+h6,
+p,
+blockquote,
+pre,
+a,
+abbr,
+acronym,
+address,
+big,
+cite,
+code,
+del,
+dfn,
+em,
+img,
+ins,
+kbd,
+q,
+s,
+samp,
+small,
+strike,
+strong,
+sub,
+sup,
+tt,
+var,
+b,
+u,
+i,
+center,
+dl,
+dt,
+dd,
+ol,
+ul,
+li,
+fieldset,
+form,
+label,
+legend,
+table,
+caption,
+tbody,
+tfoot,
+thead,
+tr,
+th,
+td,
+article,
+aside,
+canvas,
+details,
+embed,
+figure,
+figcaption,
+footer,
+header,
+hgroup,
+menu,
+nav,
+output,
+ruby,
+section,
+summary,
+time,
+mark,
+audio,
+video {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-size: 100%;
+  font: inherit;
+  vertical-align: baseline;
+}
+/* HTML5 display-role reset for older browsers */
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+hgroup,
+menu,
+nav,
+section {
+  display: block;
+}
+body {
+  line-height: 1;
+}
+ol,
+ul {
+  list-style: none;
+}
+blockquote,
+q {
+  quotes: none;
+}
+blockquote:before,
+blockquote:after,
+q:before,
+q:after {
+  content: "";
+  content: none;
+}
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}

src/components/Header.tsx

@@ -0,0 +1,16 @@
+import React from "react";
+import "./../assets/styles/Header.css";
+
+function Header() {
+  return (
+    <header className="site-header">
+      <div className="wrapper site-header__wrapper">
+        <a href="" className="brand">
+          都道府県別の総人口推移グラフ
+        </a>
+      </div>
+    </header>
+  );
+}
+
+export default Header;