stylesheet.css

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
    background-color: #d3d3d3;
	display: grid;
	justify-content: center;
	align-content: center;
	box-sizing: border-box;
	font-size: 10rem;
	font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}
#calculatorBody {
	width: 500px;
  	border: 2px black solid;
  	border-radius: 15px;
  	margin: 30px auto;
  	padding: 20px;
  	background-color: grey;
	
	
}
.buttonGrid {
	display: grid;
	grid-gap: 10px;
	grid-template-columns: repeat(4, 1fr);
}
.btn {
	padding: 20px;
	border: 1px black solid;
	border-radius: 50%;
	background-color:gainsboro;
	font-size: 2rem;
	outline: none;
	cursor: pointer;
}
.btn:hover{
	background-color: rgba(34, 207, 238, 0.774);
}
.operator {
	background-color: rgb(42, 163, 233);
}
#screen{
	font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
	color: rgb(2, 49, 2);
	min-height: 80px;
  	padding: 20px;
  	border: 2px rgb(78, 78, 78) solid;
  	border-radius: 5px;
  	margin-bottom: 20px;
  	background-color: rgb(32, 145, 145);
  	font-size: 2rem;
  	text-align: right;
  	word-wrap: break-word;
  	word-break: break-all;
}
.spanAc {
	grid-column: span 2;
	background-color: rgb(247, 94, 125);
}
.spanC {
	grid-column: span 2;
	background-color: rgb(241, 74, 107);
}