@import url('https://fonts.googleapis.com/css?family=Noto+Sans+JP');

/*まずはお決まりのボックスサイズ算出をborer-boxに */
*,
*:before,
*:after {
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

html {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  font-size: 62.5%;/*rem算出をしやすくするために*/
}

.btn,
a.btn,
button.btn {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.5;
    position: relative;
    display: inline-block;
    padding: 1rem 4rem;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-transition: all 0.3s;
    transition: all 0.3s;
    text-align: center;
    vertical-align: middle;
    text-decoration: none;
    letter-spacing: 0.1em;
    color: #212529;
    border-radius: 0.5rem;
}

.title {
    margin: 0px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 3rem;
    font-weight: bold;
}

header {
    display: flex;
    justify-content: center; /* 横方向 */
    align-items: center;     /* 縦方向 */
    height: 70px;           /* 高さが必要 */
    background-color: rgb(171, 171, 171);
    margin: 0px;
    border-top: solid 2px #6cb4e4;
    border-bottom: solid 2px #6cb4e4;
    background: -webkit-repeating-linear-gradient(-45deg, #f0f8ff, #f0f8ff 3px,#e9f4ff 3px, #e9f4ff 7px);
    background: repeating-linear-gradient(-45deg, #f0f8ff, #f0f8ff 3px,#e9f4ff 3px, #e9f4ff 7px);
}

/*主な共通部分は省略*/

a.btn-border {
    border: 2px solid #000;
    border-radius: 0;
    background: #fff;
}

a.btn-border:hover {
    color: #fff;
    background: #000;
}

.content {
    margin: 0px;
    padding: 0px;
    display: flex;
    flex-direction: column;
    justify-content: center; /* 横方向 */
    align-items: center;     /* 縦方向 */
    min-height: 150px; /* 高さが必要 */
}

h1 {
  color: #6cb4e4;
  text-align: center;
  padding: 0.25em;
}