button.accordion {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    border: 1px solid #fff;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
    padding: 18px;
    width: 100%;
} 

button.accordion.active, button.accordion:hover {
    background-color: #ddd; 
}


div.panel {
    display: none;
    background-color: #f5f5f5;
    font-family: Helvetica,Arial,sans-serif;
    margin-bottom: 20px;
    border: 1px solid #e3e3e3;
    padding: 0 18px;
}    
    
.center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}


.leadin { 
    font-weight: bold;
}



button.accordion.active, button.accordion:hover {
    background-color: #ccc; 
}


button.accordion:after {
    content: '\02795'; /* Unicode character for "plus" sign (+) */
    font-size: 13px;
    color: #777;
    float: right;
    margin-left: 5px;
}

button.accordion.active:after {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}