*{
    margin: 0; padding: 0;
    box-sizing: border-box;
}
body{
    font-family: 'Calibri';
    background: #333;
}
.container{
    background: #fff;
    display: flex;
    justify-content: center;
    flex-direction: column;
    width: 400px;
    margin: 100px auto;
    padding: 10px;
    border-radius: 10px;
}
.view{
    border: 1px solid grey;
    margin: 5px;
    height: 80px;
    overflow: hidden;
}
.view #result{
    font-size: 60px;
    float: right;
    margin-right: 10px;
}
.buttons_container{
    display: flex;
    flex-direction: column;
    align-items: center;
}
.buttons_container .button{
    font-size: 40px;
    cursor: pointer;
    margin: 5px;
    width: 82px;
    border: 1px solid #333;
}
#igual{
    width: 175px;
    background: orangered;
    color: #fff;
}