*{
    box-sizing:border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

.caption{
    text-align: center;
    font-size: 40px;
    font-weight:bold;
    color:#5fdb49
}

.line {
    width: 75%;
    margin: 25px auto;
    border: none;
    border-top: 4px solid #5fdb49;
    border-radius: 5px;
    opacity: 0.7;
}

body{
    background-color: #f7faf7;
    padding: 50px 20px;
}

.khungve{
    margin-bottom: 30px;
}

.trangchu{
    display: inline-block;
    background-color: #5fdb49;   
    color: #ffffff;                
    padding: 12px 24px;             
    border-radius: 8px;            
    text-decoration: none;         
    font-weight: bold;
    font-size: 16px;
    box-shadow: 0 4px 12px rgba(95, 219, 73, 0.3); 
    transition: all 0.3s ease;      
}

.trangchu:hover {
    background-color: #2e7d32;     
    transform: translateY(-3px);    
    box-shadow: 0 6px 16px rgba(46, 125, 50, 0.4);
}

.danhsach {
    display: grid;
    grid-template-columns: repeat(4, 1fr); 
    gap: 20px; 
    max-width: 800px; 
    margin: 40px auto;  
}

.bai {
    display: block;                        
    background-color: #ffffff;             
    color: #5fdb49;                       
    border: 2px solid #5fdb49;             
    padding: 16px 0;                       
    border-radius: 10px;                  
    text-decoration: none;                
    text-align: center;                   
    font-size: 18px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.03); 
    transition: all 0.3s ease;          
}

.bai:hover {
    background-color: #5fdb49;
    color: #ffffff;
    transform: translateY(-4px);    
    box-shadow: 0 8px 18px rgba(95, 219, 73, 0.3);
}