*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body{
    background-color: cadetblue;
    margin: 10px;
    color: white;
}

p{
    margin: 10px 0px
}

#container{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

.grid-item{
    background-color: cadetblue;
    height: 300px;
    border: 20px solid white;
    border-bottom: 60px solid white;
}