style.css

.sTable {
  	position: relative;
  	display: inline-block;
  	border: 1px solid #48AAE6;
  	margin: 55px;
}
.sTable table {
  	border-collapse: collapse;
}
.sTable table td {
  	background-color: #48AAE6;
  	width: 50px;
  	height: 50px;
  	border: 2px solid white;
}
.sTable button {
  	position: absolute;
  	width: 50px;
  	height: 50px;
  	border: none;
  	color: white;
  	font-size: 24px;
  	margin: 2px;
  	cursor: pointer;
  	transition: left .45s ease, top .45s ease, opacity .45s ease;
}
.sTable button:hover {
  	opacity: .75;
}
.sTable .addRow {
 	background-color: #F3A500;
  	top: 100%;
  	left: 0;
}
.sTable .addCol {
  	background-color: #F3A500;
  	top: 0;
  	left: 100%;
}
.sTable .delRow {
  	background-color: #B20000;
  	visibility: hidden;
  	right: 100%;
  	top: 0;
}
.sTable .delCol {
  	background-color: #B20000;
  	visibility: hidden;
  	bottom: 100%;
  	left: 0;
}