.collapsible {
    background-color: #202020;
    color: white;
    cursor: pointer;
    padding: 16px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 14px;
}

.active, .collapsible:hover {
    background-color: #505050;
}

.content {
    padding: 10px;
    display: block;
    overflow: hidden;
    color:white;
    font-size: 12pt;
    background-color: #808080;
}

textarea {
height:200px;
     width: 100%;
     -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
     -moz-box-sizing: border-box;    /* Firefox, other Gecko */
     box-sizing: border-box;         /* Opera/IE 8+ */
}