*{

    box-sizing: border-box;
}

body{
    height: 100vh;
    width: 100%;
    justify-content: center;
    align-items: center;
    display: flex;
}
.container{
    height: 400px;
    width: 400px;
    border: 2px solid;
    display: grid;
    align-items: center;
    border-radius: 20px;
    box-shadow: 5px 5px 10px;
}
.upper{
    padding: 20px;
    display: flex;
    justify-content: space-between;
    height: 60px;
}

.output{
    height: 300px;
    border-top: 2px solid;
    padding: 10px;
    margin: 50px;
    justify-content: space-between;
    padding-top: 50px;
    text-align: center;
}
button{
    border-radius: 10px;
    margin: 10px 10px;
    height:40px;
    cursor: pointer;
}