html {
  margin: 0px;
  padding: 0px;
  background-color: #ddd;
}

body {
  max-width: 480px;
  margin: 128px auto;
  padding: 32px;
  background-color: #fff;
  border-radius: 16px;
  box-shadow: 0px 0px 32px #0004;
}

form {
  font-family: inherit;

  fieldset {
    border: none;

    > legend {
      width: 100%;
      margin: 0px auto;
      padding: 0px 0px 8px 0px;
      border-bottom: 1px solid #aaa;
      text-align: center;
      color: #777;
    }
  }

  dl {
    margin: 32px 32px;
    padding: 0px;

    dt {
      margin: 16px 0px 0px 0px;
      padding: 0px;
      line-height: 40px;
    }

    dd {
      margin: -40px 0px 0px 128px;
      padding: 0px;

      mark {
        margin: 4px 0px;
        text-align: left;
      }
    }
  }

  input {
    display: block;
    width: 100%;
    padding: 0px 12px;
    min-height: 40px;
    box-sizing: border-box;
    border: 1px solid #888;
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
  }

  input[type="password"] {
    font-family: monospace;
  }

  button {
    font-family: "BIZ UDPGothic", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", Meiryo, メイリオ, Osaka, "MS PGothic", arial, helvetica, sans-serif;
    font-size: 100%;
    height: 32px;
    padding: 0px 32px;
    border: 0px;
    border-radius: 64px;
    background-color: hsl(216, 30%, 50%);
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
  }

  button:hover {
    background-color: hsl(216, 30%, 60%);
  }

  menu {
    list-style-type: none;
    margin: 32px 0px;
    padding: 0px;

    li {
      text-align: center;
    }
  }

  mark {
    display: block;
    margin: 4px 32px;
    padding: 0px;
    background-color: transparent;
    text-align: center;
    font-family: inherit;
    font-size: 0.9rem;
    color: #9b3d12;
  }
}