html,
body {
  height: 100vh;
}

body {
  font-family: "Hiragino Kaku Gothic Pro","ヒラギノ角ゴ Pro W3","メイリオ",Meiryo,"ＭＳ Ｐゴシック",sans-serif;
  font-size: 1.0rem;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 100px;
  padding-bottom: 100px;
  background-color: #f5f5f5;
}

i {margin-right: 0.2rem;}

.form-signin ,.form-signup ,.form-guest {
  width: 100%;
  max-width: 450px;
  margin: 0 auto;
  padding: 2rem;
  background-color: #FFF;
  font-size: .8rem;

}
.form-signin .checkbox {
  font-weight: 400;
}
.form-signin .form-control {
  position: relative;
  box-sizing: border-box;
  height: auto;
  padding: 10px;
  font-size: 16px;
}
.form-signin .form-control:focus {
  z-index: 2;
}

.form-signin input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.form-signin input[type="password"] {
  margin-bottom: 2rem;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.form-signup input, .form-guest input {margin-bottom: 1rem;}

/* エラー・成功テキスト　*/
.error-txt,.success-txt {margin: .5rem 0;font-weight: bold;}
.error-txt {color:red;}
.success-txt {color: #28a745;}