@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap');

*{
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.page{
    height: 750px;
    width: 100%;
    background-color: blue;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calc{
    background-color:black;
    height: 70%;
    width: 30%;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
}

.output-display{
    width: 100%;
    height: 33%;
    background-color: black;
    display: flex;
    justify-content: right;
    align-items: flex-end;

}

.output{
    color: white;
    font-size: 50px;
}

.columns{
    width: 100%;   
    height: 67%;
    background-color: black;
    

    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
}

button{
    background-color: yellow;
    border-radius: 100%;
    border: 0px;
    height: 70px;
    width: 70px;
    font-size: 25px;
    
}

.column-1, .column-2, .column-3, .column-4 {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    background-color: black;
}

.bottom-row{
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
}

.btn-0{
    width: 41%;
    border-radius: 100%/ 150px;
    text-align: left;
}