body{
background: rgb(0, 0, 0);
}
#canvas{
box-sizing:border-box;
display: flex;
align-items: center;
justify-content: center;
background: rgb(255, 255, 255);
width: 700px;
height: 300px;
margin: 50px auto;
border-radius: 25px;
}
#primary-number, #secondary-number{
display:flex;
align-items:center;
justify-content: center;
font-size: 40px;
font-weight: bold;
width: 125px;
height: 125px;
box-sizing: border-box;
}
#primary-number{
border: solid 4px rgb(0, 0, 0);
border-radius: 25px;
}
#secondary-number{
border: solid 4px rgb(0, 0, 0);
border-radius: 25px;
}
#add, #equal{
font-weight: bold;
font-size: 40px;
padding: 5px;
}
input{
border: solid 2px rgb(0, 0, 0);
width: 150px;
height: 30px;
padding-left: 25px;
border-radius: 15px;
}
button{
width: 100px;
height: 35px;
margin: 5px;
background: rgb(0, 0, 0);
color: white;
border: 1px solid lightgrey;
border-radius: 25px;
}