diff --git a/cal2.css b/cal2.css
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+/*課題3*/
+th {text-align: center;
+    width: 50px;
+    font-family: "serif";
+    font-weight: hold;}
+th:first-child {background: red;}
+th:first-child + th {background-color: pink;}
+th:first-child + th + th {background-color: orange;}
+th:first-child + th + th + th {background-color: aqua;}
+th:first-child + th + th + th + th {background-color: maroon;}
+th:first-child + th + th + th + th + th {background-color: yellow;}
+th:first-child + th + th + th + th + th + th {background-color: blue;}
+
+td {text-align: right;
+    width: 50px;
+    font-family: Georgia, serif;
+    font-weight: lighter;}
+td:first-child {color: red;}
+td:last-child {color: blue;}
+td.holiday {color: red;}