#back{
  background:#00000073;
  margin-bottom:20px;
}
#next{
  vertical-align: top;
}
input[type=datetime-local] {
  padding: 0.6875em;
  border: 1px solid #D68D9D;
  border-radius: 0.5em;
}

.any{
  display: inline-block;
  margin-left:5px;
  vertical-align: text-bottom;
  padding: 0 8px;
  background: #36B9EF;
  border-radius: 4px;
  color: #fff;
  font-size: 0.75em;
}
.add{
  width: 100%;
  max-width: 340px;
  box-shadow: none;
  margin: 0 auto;
  padding: 1.6111em;
  border: 0;
  border-radius: 3em;
  background: #2196F3;
  color: #fff;
  font: 700 1.125rem/1.334 "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  text-align: center;
  text-decoration: none;
  text-shadow: none;
}