/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

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/* Căn lề cơ bản */
body {
    margin: 0;
    font-family: sans-serif;
    background-color: #f0f2f5;
}

/* Kiểu dáng tiêu đề */
.main-header {
    text-align: center;
    padding: 50px 0;
    background: #333;
    color: white;
}

/* Tạo lưới ảnh */
.container {
    max-width: 1000px;
    margin: 30px auto; /* Căn giữa khối ảnh */
    padding: 0 15px;
}

.grid-layout {
    display: grid;
    /* Lệnh quan trọng: tạo 3 cột bằng nhau */
    grid-template-columns: repeat(3, 1fr); 
    /* Khoảng cách giữa các ảnh */
    gap: 20px;
}

/* Định dạng hình ảnh */
.item img {
    width: 100%;       /* Ảnh tự co dãn theo cột */
    height: 200px;     /* Chiều cao cố định */
    object-fit: cover; /* Cắt ảnh vừa vặn không bị méo */
    border-radius: 10px;
    transition: 0.3s;
}

/* Hiệu ứng phóng to khi di chuột vào */
.item img:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}