Grid 布局结合媒体查询@media实现动态列布局

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        .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }

        @media screen and (max-width: 1200px) {
            .container {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        @media screen and (max-width: 900px) {
           .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media screen and (max-width: 600px) {
           .container {
                grid-template-columns: 1fr;
            }
        }
        .item {
            height: 100px;
            background-color: aliceblue;
        }

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