*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: inherit; 
}

html {
  box-sizing: border-box;
  font-size: 50%;
  background-color: rgb(225, 230, 255);
  color: rgb(4, 52, 83);
}

body {
  font-family: "Nunito", sans-serif;
  color: #333;
  font-weight:250;
  line-height: 1.6;
  text-align: center;
}

.container {
  height: 900px;
  width: 100%;
  margin: 2rem auto; 
}

.overlay {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  background-color: #008CBA;
  overflow: hidden;
  width: 100%;
  height:0;
  transition: .5s ease;
}

.container:hover .overlay {
  bottom: 0;
  height: 100%;
}

.text {
  color: white;
  font-size: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 5vw);
  grid-gap: 2.5rem; 
}

.gallery__img {
  width: 180%;
  height: 180%;
  object-fit: cover;
  display: block;
 
  padding: 10px;
  box-shadow: 5px 10px #1a1a1b28;
}

.gallery__item--1 {
  grid-column-start: 1;
  grid-column-end:5;
  grid-row-start: 1;
  grid-row-end: 3;

  /** Alternative Syntax **/
  /* grid-column: 1 / span 2;  */
  /* grid-row: 1 / span 2; */
}

.gallery__item--2 {
  grid-column-start: 5;
  grid-column-end: 9;
  grid-row-start: 4;
  grid-row-end: 6;

}

.gallery__item--3 {
  grid-column-start: 5;
  grid-column-end: 9;
  grid-row-start: 1;
  grid-row-end: 3;

  /** Alternative Syntax **/
  /* grid-column: 5 / span 4;
  grid-row: 1 / span 5; */
}

.gallery__item--4 {
  grid-column-start: 1;
  grid-column-end: 5;
  grid-row-start: 4;
  grid-row-end: 6;

  /** Alternative Syntax **/
  /* grid-column: 1 / span 4;  */
  /* grid-row: 3 / span 3; */
}

.gallery__item--5 {
  grid-column-start: 1;
  grid-column-end: 5;
  grid-row-start: 7;
  grid-row-end: 9;

  /** Alternative Syntax **/
  /* grid-column: 1 / span 4; */
  /* grid-row: 6 / span 3; */
}

.gallery__item--6 {
  grid-column-start: 5;
  grid-column-end: 9;
  grid-row-start: 7;
  grid-row-end: 9;

  /** Alternative Syntax **/
  /* grid-column: 5 / span 4; */
  /* grid-row: 6 / span 3; */
}