body {margin:0; font-family: Calibri, Verdana, sans-serif;}
.logo-background {background-image: url('pictures/othtcbg.gif');}
.whitespace  {
   margin:auto;
   background:white;
   box-sizing: border-box; 
   max-width:900px;
   padding:10px 30px 30px;
}

.border {
  border:1px solid #ddd;
}

h1, h2, h3 {font-family: Calibri, Geneva, sans-serif;}

p, li {font-family: "Century Gothic", Geneva, sans-serif;}  

p a, li a {color:#629d75;}

#topBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: hsl(139, 23%, 50%, 0.7);
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
}

#topBtn:hover {
  background-color: hsl(0, 0%, 30%, 0.7);
}