style.css

body {
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	height: 100vh;
	position: relative;
	background-color: #eee;
}

td {
	border: 2px solid #888;
	height: 200px;
	min-width: 200px;
	text-align: center;
	vertical-align: middle;
	font-family: "Comic Sans MS", cursive, sans-serif;
	font-size: 70px;
	cursor: pointer;
}

table {
	border-collapse: collapse;
	margin:0 auto;
	vertical-align: middle;
}

table tr:first-child td {
	border-top:none;
}
table tr:last-child td {
	border-bottom:none;
}
table tr td:first-child {
	border-left:none;
}
table tr td:last-child {
	border-right:none;
}


.hidden {
	display: none !important;
}

.win {
	background-color: rgba(2, 184, 117, 0.91);
    box-shadow: 0 0 10px 5px rgba(2, 184, 117, 0.35);
}

.lose {
    background-color: rgba(255, 99, 99, .9);
    box-shadow: 0 0 10px 5px rgba(255, 99, 99, .35);
}

.tie {
	background-color: rgba(50, 50, 50, .9);
    box-shadow: 0 0 10px 5px rgba(50, 50, 50, .35);
}

#end_game {
    height: 250px;
    width: 400px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    border-radius: 7px;

    display: flex;
    flex-direction: column;
   	justify-content: space-evenly;
   	align-items: center;
}

#end_game_text {
	display: flex;
	justify-content: center;
	align-items: center;
	font-size: 30px;
	font-family: sans-serif;
	color: #fff;
}

#start_game {
	border: none;
    outline: none;
    cursor: pointer;
    color: #444;
    background-color: #ddd;
    font-size: 13px;
    border-radius: 3px;
    padding: 7px 15px;
    font-family: monospace;
    text-transform: uppercase;
    box-shadow: 3px 3px 10px 1px #000;
}
#start_game:hover {
	background-color: #ccc;
	color:#000;
	box-shadow: 1px 1px 10px 0px #222;
}