.grid-demo{
display: grid;
grid-template-columns: repeat(3, 200px);
gap: 1rem;
}


.nav {
display: flex;
justify-content: space-between;
align-items: center;
} 

.cards {
display: flex;
flex-wrap: wrap;
gap: 1.5rem;
}
.cards > div {
flex: 1 1 250px;
} 

.container {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}

.page {
display: grid;
grid-template-columns: 200px 1fr;
grid-template-rows: auto 1fr auto;
height: 100vh;
}
.header, .footer {
grid-column: 1 / -1;
}
.card-row {
display: flex;
gap: 1rem;
}