/*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;}