style.css

/* Google fonts */

@import url('https://fonts.googleapis.com/css?family=Montserrat:400,400i,700,700i|Pacifico&subset=latin-ext');
/* nejsme vcerejsi, pouzivame moderni a intuitivni box model */

html {
	box-sizing: border-box;
}

*,
::after,
::before {
	box-sizing: inherit;
}

body {
	margin: 0;
	padding: 50px;
	font: 18px/1.5 sans-serif;
	background-color: white;
	color: black;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	font-family: "Montserrat", serif;
}

h1 {
	font-size: 36px;
}

img {
	margin: 30px 0;
}

li {
	margin-bottom: 0.5em;
}

.napoveda {
	margin-top: 50px;
	padding: 20px;
	border: 1px dashed tomato;
	background-color: #f5f5f5;
}

.ctverecek {
	width: 150px;
	height: 150px;
	text-align: center;
	line-height: 150px;
	background-color: yellow;
	border: 1px solid black;
	box-shadow: 5px 5px 8px rgba(0, 0, 0, 0.25);
}

.tlacitko {
	display: inline-block;
	font-family: Monserrat, sans-serif;
	font-size: 36px;
	font-weight: bold;
	color: #fff;
	text-decoration: none;
	text-align: center;
	text-shadow: 1px 1px 0px #c5376d;
	padding: 10px 30px;
	position: relative;
	cursor: pointer;
	border: none;
	background: #f78db5;
	background-image: linear-gradient(bottom, #f78db5 0%, #ef5a92 100%);
	border-radius: 5px;
	box-shadow: 0px 5px 0px 0px #c5376d, 0px 10px 5px #999;
}

.tlacitko:active {
	top: 3px;
	box-shadow: 0px 2px 0px 0px #c5376d, 0px 5px 3px #999;
}

.obrazek {
	display: block;
	margin: 50px 0;
}

.ctverecek {
	margin: 50px 0;
	width: 200px;
	height: 200px;
	font-family: "Montserrat", sans-serif;
	font-size: 120px;
	font-weight: bold;
	line-height: 1;
	display: flex;
	justify-content: center;
	align-items: center;
	border: 3px solid;
	border-radius: 10px;
}

.zluty {
	background-color: yellow;
	color: red;
	border-color: orange;
}

.zeleny {
	background-color: greenyellow;
	color: black;
	border-color: green;
}


.aktivni {
	background-color: cyan;
	color: black;
	border-color: blue;
}

.tucnePismo {
	font-weight: bold;
}

.cervenePismo {
	color: red;
}