header .logo {
  max-width: 180px;
}

/* image placeholder */
.img-placeholder {
  display: block;
  position: relative;
  overflow: hidden;
  padding-top: var(--ratio, 100%);
}

.img-placeholder>img {
  position: absolute;
  z-index: 1;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: 100%;
}

.img-placeholder.img-placeholder-4by3 {
  padding-top: 75%;
}

.img-placeholder.img-placeholder-3by2 {
  padding-top: 66.66667%;
}

.img-placeholder.img-placeholder-16by9 {
  padding-top: 56.25%;
}

.img-placeholder.img-placeholder-2by1 {
  padding-top: 50%;
}

@media (min-width: 576px) {}

@media (min-width: 720px) {}

@media (min-width: 992px) {}

@media (max-width: 991px) {}

@media (max-width: 1260px) {}

@media (max-width: 719px) {}

@media (max-width: 575px) {}

@media (max-width: 375px) {}