body, html {
	height: 100%;
	margin: 0;
	font-family: Arial;
}

table, th, td {
	border: 1px solid black;
	border-collapse: collapse;
	background-color: #ddd
}

td#sfreq {
	background-color: #ccc;
}

.tab {
	overflow: hidden;
	border: 1px solid #ccc;
}

.tab button {
	background-color: inherit;
	float: left;
	border: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	transition: 0.3s;
}

.tab button:hover {
	background-color: #ddd;
}

.tab button.active {
	background-color: #ccc;
}

.tabcontent {
	display: none;
	padding: 6px 12px;
	border: 1px solid #ccc;
	border-top: none;
	height: 100%;
}

html {
  font-family: Helvetica;
  display: inline-block;
  margin: 0px auto;
  text-align: center;
}
h1{
  color: #0F3376;
  padding: 2vh;
}
p{
  font-size: 1.5rem;
}
.button {
  display: inline-block;
  background-color: #008CBA;
  border: none;
  border-radius: 4px;
  color: white;
  padding: 16px 40px;
  text-decoration: none;
  font-size: 30px;
  margin: 2px;
  cursor: pointer;
}
.button2 {
  background-color: #f44336;
}