* {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  vertical-align: top;
}

.gallery1 {
  display: flex;
  margin: auto;
  max-width: 600px;
  position: relative;
  padding-top: 66.6666666667%;
}
@media screen and (min-width: 600px) {
  .gallery1 {
    padding-top: ;
  }
}
.gallery1__img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.gallery1__thumb {
  padding-top: 6px;
  margin: 6px;
  display: block;
  max-width: 50px;
}
.gallery1__selector {
  position: absolute;
  opacity: 0;
  visibility: hidden;
}
.gallery1__selector:checked + .gallery1__img {
  opacity: 1;
}
.gallery1__selector:checked ~ .gallery1__thumb > img {
  box-shadow: 0 0 0 3px #0C8990;
}

/* G2 */
.gallery2 {
  display: flex;
  margin: auto;
  max-width: 600px;
  position: relative;
  padding-top: 66.6666666667%;
}
@media screen and (min-width: 600px) {
  .gallery2 {
    padding-top: ;
  }
}
.gallery2__img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.gallery2__thumb {
  padding-top: 6px;
  margin: 6px;
  display: block;
  max-width: 50px;
}
.gallery2__selector {
  position: absolute;
  opacity: 0;
  visibility: hidden;
}
.gallery2__selector:checked + .gallery2__img {
  opacity: 1;
}
.gallery2__selector:checked ~ .gallery2__thumb > img {
  box-shadow: 0 0 0 3px #0C8990;
}

/* G3 */
.gallery3 {
  display: flex;
  margin: auto;
  max-width: 600px;
  position: relative;
  padding-top: 66.6666666667%;
}
@media screen and (min-width: 600px) {
  .gallery3 {
    padding-top: ;
  }
}
.gallery3__img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.gallery3__thumb {
  padding-top: 6px;
  margin: 6px;
  display: block;
  max-width: 50px;
}
.gallery3__selector {
  position: absolute;
  opacity: 0;
  visibility: hidden;
}
.gallery3__selector:checked + .gallery3__img {
  opacity: 1;
}
.gallery3__selector:checked ~ .gallery3__thumb > img {
  box-shadow: 0 0 0 3px #0C8990;
}

/* G4 */
.gallery4 {
  display: flex;
  margin: auto;
  max-width: 600px;
  position: relative;
  padding-top: 66.6666666667%;
}
@media screen and (min-width: 600px) {
  .gallery4 {
    padding-top: ;
  }
}
.gallery4__img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.gallery4__thumb {
  padding-top: 6px;
  margin: 6px;
  display: block;
  max-width: 50px;
}
.gallery4__selector {
  position: absolute;
  opacity: 0;
  visibility: hidden;
}
.gallery4__selector:checked + .gallery4__img {
  opacity: 1;
}
.gallery4__selector:checked ~ .gallery4__thumb > img {
  box-shadow: 0 0 0 3px #0C8990;
}