.container {
  min-width: 507px;
}

.contents {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
     -moz-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  height: 100vh;
  overflow-y: auto;
}

.ttl--lineshort {
  padding-bottom: 18px;
  margin-bottom: 49px;
  font-family: "Open Sans", sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.login_area {
  width: 507px;
  margin: 0 auto;
}

.login_area input:not(:last-of-type) {
  margin-bottom: 26px;
}

.login_area input::-webkit-input-placeholder {
  color: #aaa;
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  opacity: 1;
}

.login_area input::-moz-placeholder {
  color: #aaa;
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  opacity: 1;
}

.login_area input:-ms-input-placeholder {
  color: #aaa;
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  opacity: 1;
}

.login_area input::placeholder {
  color: #aaa;
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  opacity: 1;
}

.login_area .ttl {
  text-align: center;
}

.login_area .ttl--lineshort {
  position: relative;
  margin-bottom: 90px;
  border-bottom: none;
}

.login_area .ttl--lineshort::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  display: block;
  width: 67px;
  height: 3px;
  margin-left: -33.5px;
  background: #62a1ae;
}

.login_area .btn {
  display: block;
  width: 100%;
  padding: 16px;
  margin-top: 38px;
  background-color: #62a1ae;
  -moz-border-radius: 10px;
       border-radius: 10px;
  font-size: 2rem;
  color: #fff;
  font-weight: bold;
  text-align: center;
  letter-spacing: 0.05em;
}