I am working on a calculator layout and have a small issue with the layout. On the right side of the calculator, the black spacing on the edge of the calculator is slightly off. I've been banging my head trying to figure it out and was hoping that I could get some assistance with it. I have attached the link to the codepen for your review.
Click here to go to my Codepen
My CSS code is listed below:
.button-container > a {
width: 50px;
height: 50px;
float: left;
margin: 0 auto;
padding: 0;
display: inline-block;
line-height: 50px;
text-align: center;
color: white;
font-family: 'Roboto', serif;
background: #333333;
margin: 1px;
text-decoration: none;