body {background-color: #202020;}
h1   {color: #E0E0E0;}
p    {color: #E0E0E0;} /* text-align: center;}*/
/*span {color: #E0E0E0; text-align: center; width:100%; margin:auto;}*/

.center {
    width:100%;
    margin:auto;
    text-align:center;
}

.acknowledgments {
    width:100%;
    margin:auto;
    text-align:center;
    color: #909090;
    font-size: 12px;
}

/* https://www.w3schools.com/css/css_link.asp */
/* unvisited link */
a:link {
  color: #FFFF00;
}

/* visited link */
a:visited {
  color: #FF8000;
}

/* mouse over link */
a:hover {
  color: #FFFF00;
}

/* selected link */
a:active {
  color: #FF0000;
} 

button {
    background-color: gray;
    border: none;
    color: white;
    padding: 10px 24px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

.deleteButton {
    background-color: red;
    color: white;
}

.addButton {
    background-color: green;
    color: white;
}