src/styles/_mailSignup.scss

.mailSignup {
  @include S-flex-rowWrap;
}
  .mailSignup__title {
    @include S-flexItem-full;
    font-weight: bold;
    margin-bottom: 0.5em;
  }
  .mailSignup__input {
    @include S-flexItem-share;
    margin-right: 0.5em;
  }
  .mailSignup__submit {
    @include S-flexItem-noFlex;
  }

@include r-media(l) {
  .mailSignup__title {
    @include S-flexItem-noFlex;
    margin: 0 1.5em 0 0;
    align-self: center;
  }
}