first commit

历届学生/zheng-yuqing/项目练习/上课项目/千千音乐/css/public.css

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+/* 公共css */
+.center {
+    width: 1200px;
+    margin: 0 auto;
+    height: 100%;
+}
+
+.left {
+    float: left;
+}
+
+.right {
+    float: right;
+}
+
+.auto {
+    overflow: hidden;
+}
+
+.relative {
+    position: relative;
+}
+
+.absolute {
+    position: absolute;
+}