main.css

+* { box-sizing: border-box; }
+html, body {
+  padding: 0;
+  margin: 0;
+  height: 100%;
+  background-image: url("2.jpg");
+  background-repeat: no-repeat;
+  background-position: center bottom;
+}
+.btn {
+    display: inline-block;
+    padding: 0 5px;
+    text-decoration: none;
+    cursor: pointer;
+    border-radius: 4px;
+    background: white;
+    border: 3px solid #ffe9a6;
+    color: crimson;
+    height: 37px;
+    width: 80px;
+    line-height: 37px;
+    vertical-align: top;
+    font-size: 20px;
+    text-align: center;
+}
+html, h1{font-family: 'Song Myung';}
+html, h2{font-family: 'Yeon Sung';}
+input, textarea {
+    border-radius: 4px;
+    height: 37px;
+    padding: 10px;
+    border: 1px solid silver;
+}
+.container { width: 100%; height: 100%; }
+@media screen and (min-width: 800px) {
+    .container { width: 800px; margin: auto; padding-top: 30px}
+}
+.input-group { margin-bottom: 15px; }
+.input-group label { width: 25%; display: inline-block; }
+.input-group input { width: 70%; }
+#join { float: right; }
+.profile-wrap {
+    width: 100%;
+    display: inline-block;
+    vertical-align: top;
+    margin: 10px 0;
+}
+@media screen and (min-width: 800px) {
+    .profile-wrap { width: 290px; margin-bottom: 0;}
+}
+.profile {
+    text-align: left;
+    padding: 20px;
+    margin-right: 10px;
+    border-radius: 4px;
+    border: 4px solid black;
+    background: #ffe9a6;
+    color: white;
+}
+.user-name, .user-money {
+    font-size: 18px;
+    margin-bottom: 10px;
+}
+.timeline {
+    margin-top: 10px;
+    width: 100%;
+    display: inline-block;
+    border-radius: 4px;
+    vertical-align: top;
+}
+@media screen and (min-width: 800px) { .timeline { width: 500px; } }
+#good-list, #good-list th, #good-list td {
+    border: 1px solid black;
+    border-collapse: collapse;
+}
+#good-list img { max-height: 45px; vertical-align: top; }
+#good-img { width: 280px; }
+.error-message { color: red; font-weight: bold; }
+#join-form, #good-form { padding: 10px; text-align: center; }
+footer { text-align: center; }