*,
          *::after,
          *::before {
            margin: 0;
            padding: 0;
            box-sizing: inherit; 
          }
          
          html {
            box-sizing: border-box;
            font-size: 62.5%; 
          }
          
          body {
            font-family: "Nunito", sans-serif;
            color: #333;
            font-weight: 300;
            line-height: 1.6; 
          }
          
          .container {
            width: 60%;
            margin: 2rem auto; 
          }

          @media all and (max-width: 800px) {
            .gallery {
            display: grid;
            grid-gap: 20px;
            grid-template-columns: 1fr;
            grid-template-rows: repeat(6, auto);
            grid-template-areas:  "gallery__item--1"
                                  "gallery__item--2" 
                                  "gallery__item--3"
                                  "gallery__item--4"
                                  "gallery__item--5"
                                  "gallery__item--6"}
            }
          .gallery {
            display: grid;
            grid-gap: 20px;
            grid-template-columns: repeat(8, 1fr);
            grid-template-rows: repeat(8, 5vw);
            grid-template-areas:  "gallery__item--1"
                                  "gallery__item--2" 
                                  "gallery__item--3"
                                  "gallery__item--4"
                                  "gallery__item--5"
                                  "gallery__item--6"
          }
          
          .gallery__img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block; 
          }
          
          .gallery__item--1 {
            grid-column-start: 1;
            grid-column-end: 3;
            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: 3;
            grid-column-end: 5;
            grid-row-start: 1;
            grid-row-end: 3;
          
            /** Alternative Syntax **/
            /* grid-column: 3 / span 2;  */
            /* grid-row: 1 / span 2; */
          }
          
          .gallery__item--3 {
            grid-column-start: 5;
            grid-column-end: 9;
            grid-row-start: 1;
            grid-row-end: 6;
          
            /** 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: 3;
            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: 6;
            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: 6;
            grid-row-end: 9;
          
            /** Alternative Syntax **/
            /* grid-column: 5 / span 4; */
            /* grid-row: 6 / span 3; */
          }

        <div class="container">
            <div class="gallery">
                <figure class="gallery__item gallery__item--1">
                    <img src="imgs/1.jpg" alt="Gallery image 1" class="gallery__img">
                </figure>
                <figure class="gallery__item gallery__item--2">
                    <img src="imgs/2.jpg" alt="Gallery image 2" class="gallery__img">
                </figure>
                <figure class="gallery__item gallery__item--3">
                    <img src="imgs/3.jpg" alt="Gallery image 3" class="gallery__img">
                </figure>
                <figure class="gallery__item gallery__item--4">
                    <img src="imgs/4.jpg" alt="Gallery image 4" class="gallery__img">
                </figure>
                <figure class="gallery__item gallery__item--5">
                    <img src="imgs/5.jpg" alt="Gallery image 5" class="gallery__img">
                </figure>
                <figure class="gallery__item gallery__item--6">
                    <img src="imgs/6.jpg" alt="Gallery image 6" class="gallery__img">
                </figure>
            </div>
        </div>