body {
  margin: 0;
  background-image: url("/img/checkerboard-cross.webp");
  font-family: 'Noto Sans JP', sans-serif;
}

img.background-img{
  height: 100%;
  width: auto;
  object-fit: cover;
  filter:brightness(76%) contrast(50%);
  position: relative;
  display: flex;
}

.container{
  z-index: 10;
  min-height: 100%;
  padding-top: 2rem;
}

.nakami{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.centering{
  text-align: center;
  vertical-align: middle;
}

.full-width{
  width: 100%;
}

span.label{
  position: relative;
  top: -0.3rem;
}

#bottom-outer{
  margin-top: 3rem;
}

.margin-s{
  margin-top: 0.3rem;
}

.margin-m{
  margin-top: 0.6rem;
}

.margin-l{
  margin-top: 1.2rem;
}

.btn-large i.material-icons{
  padding-right: 0.5rem;
}

@media screen and (max-width:480px) {
  h3{
    font-size: 2rem;
  }
}