body { 
    background-color: indianred;
}

div { 
    text-align: center;
    border: 2px solid; 
    border-radius: 5px;
    border-color: skyblue;
    text-decoration: underline skyblue;
}

h1.hidden {
    display: none;
}

h1.visibility {
    visibility: hidden;
}

div.box { 
    border: 2px solid skyblue; 
}

h3.sparkler { 
    background-color:lightgreen;
    color: white;
    text-size-adjust: 50px;
    margin-right: 400px;
    margin-left: 400px;
}

img.spark { 
    width: 250px;
    height: 250px;
    float: right;
}

li {
  display: inline;
}

span.a { 
  display: inline; /* the default for span */
  width: 100px;
  height: 100px;
  padding: 5px;
  border: 1px solid blue;  
  background-color: black; 
  
}
  
span.b { 
  display: inline; /* the default for span */
  width: 100px;
  height: 100px;
  padding: 5px;
  border: 1px solid blue;  
  background-color: black; 
} 

span.c { 
  display: inline; 
  width: 200px;
  height: 200px; 
  padding: 5px; 
  border: 1px solid white; 
  background-color: black;
}