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

header{
    background-color: rgb(72, 255, 0);
    color: rgb(0, 0, 0);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}

naV UL{
    display: flex;
    list-style: none;
}

nav ul li{
    margin: 0 15px;
}

nav ul li a{
    color: blueviolet;
    text-decoration: none;
}

main{
    padding: 20px;
}

.grid-container{
    display: flex;
    justify-content: space-between;
    border: solid black;
    border-radius: 5px;
    gap: 20px;
}

.grid-item{
    background-color: cyan;
    padding: 20px;
    border: solid 1px black;
    text-align: center;
    flex: 1;
}

.grid-container{
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 20px;
}


footer{
    align-items: center;
}

@media (max-width: 768px) {
    .grid-container{
        grid-template-columns: repeat(2,1fr);
    }

    nav ul{
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .grid-container{
        grid-template-columns: 1fr;
    }

    header{
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul{
        flex-direction: column;
        align-items: flex-start;
    }

    footer {
        align-items: center;
    }
}