<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>

  <!-- reset.css destyle -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/destyle.css@1.0.15/destyle.css" />
  <link rel="stylesheet" href="css/style.css">

</head>

<body>
  <div class="container">
    <div class="c-calender">
      <div class="c-calender__header">
        <span class="arrow-right"></span>
        <p>2024年3月</p>
        <span class="arrow-left"></span>
      </div>

      <div class="c-calender__day grid">
        <span class="sun">日</span>
        <span>月</span>
        <span>火</span>
        <span>水</span>
        <span>木</span>
        <span>金</span>
        <span class="sat">土</span>
      </div>
      <div class="c-calender__date grid">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span>1</span>
        <span class="full">2</span>
        <span>3</span>
        <span>4</span>
        <span>5</span>
        <span>6</span>
        <span>7</span>
        <span class="full">8</span>
        <span>9</span>
        <span>10</span>
        <span>11</span>
        <span>12</span>
        <span>13</span>
        <span class="full">14</span>
        <span class="full">15</span>
        <span>16</span>
        <span>17</span>
        <span>18</span>
        <span class="full">19</span>
        <span>20</span>
        <span>21</span>
        <span class="full">22</span>
        <span>23</span>
        <span>24</span>
        <span>25</span>
        <span class="full">26</span>
        <span>27</span>
        <span>28</span>
        <span>29</span>
        <span>30</span>
        <span>31</span>
      </div>
    </div>
  </div>
</body>

</html>
@mixin sp {
  @media screen and (max-width: 768px) {
    @content;
  }
}

html {
  font-size: calc(10 / 1366 * 100vw);

  @include sp {
    font-size: calc(14 / 768 * 100vw);
  }
}

body {
  font-size: 1.6rem;
  background-color: #fff;
}

h2 {
  font-size: 2.4rem;
  width: 100%;
  text-align: center;
  font-weight: bold;
  margin: 3rem 0;
}

.grid{
  display: grid;
}

.container {
  width: calc(100vw - 10rem);
  margin: 0 auto;
  margin-top: 3rem;

  @include sp{
    width: calc(100vw - 5rem);
  }
}

.c-calender{
  width: 70%;
  margin: 0 auto;
  padding: 2rem;

  &__header{
    width: 100%;
    position: relative;
    padding: 1.5rem 0;
    span{
      width: 2rem;
      height: 2rem;
      border-top: 0.5rem solid #333;
      border-right: 0.5rem solid transparent;
      border-left: 0.5rem solid #333;
      border-bottom: 0.5rem solid transparent;
      position: absolute;
      top: 2rem;
    }

    .arrow{
      &-right{
        transform: rotate(135deg);
        right: 5rem;
      }
      &-left{
        transform: rotate(-45deg);
        left: 5rem;
      }
    }

    p{
      width: 100%;
      text-align: center;
      font-size: 2.4rem;
      font-weight: bold;
    }
  }

  &__day{
    height: 6rem;
    grid-template-columns: repeat(7, 1fr);
    align-content: center;
    border-bottom: 0.5px solid #ccc;

    span{
      display: block;
      text-align: center;
      font-size: 2rem;
      font-weight: bold;
    }
    .sun{
      color: red;
    }

    .sat{
      color: blue;
    }
  }

  &__date{
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: 8rem;
    gap: 0.3rem;
    margin-top: 3rem;

    span{
      display: block;
      text-align: center;
      font-size: 1.8rem;
      font-weight: bold;
      padding: 1rem;

      &:not(:empty){
        border: 2px solid #ccc;
        &:not(.full):hover{
          background-color: #FEE104;
        }
      }

      &:nth-child(7n){
      color: blue;
      }
      &:nth-child(7n+1){
      color: red;
      }
    }

    .full{
      background-color: #ccc;
    }
  }

}
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