body {
    display: flex;
    justify-content: center;
    align-items: center;
}

div {
    margin-top: 5%;
    width: 50%;
    height: 50%;
    background-color: rgb(237, 230, 230);
    border: 2px solid navy;
    display: grid;
    grid-template-rows: repeat(4,1fr);
    grid-template-columns: repeat(5,1fr);
    padding: 5%;
    box-sizing: border-box;
}

input[type=button] {
    width: 200px;
    height: 30px;
}

#btn1 {
    grid-area: 2/2/span 1/span 1;
}

#btn2 {
    grid-area: 2/4/span 1/span 1;
}