html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-color: rgba(240,240,240,0.8);
}

body {  
}

.contentWrapper {
    width: 80%;
    margin-top: 100px;
    /* margin-bottom: 200px; */
    margin-left: auto;
    margin-right: auto;
}

.header_bar {
    padding: 10px 0;
    margin-bottom: 40px;
    font-weight: bold;
    vertical-align: top;
    width: 100%;

    color: white;
    background-color: #2196F3;
    box-shadow: 0 2px 4px rgba(0,0,0,0.16), 0 2px 4px rgba(0,0,0,0.23);
    display: flex;
    align-items: flex-end;
}

.header_bar a{
    color: white;
}
.header_bar .message {
    font-size: 20px;
    flex-grow: 1;
    margin-left: 60px;
    margin-bottom: 20px;
}

.header_bar .control_panel {
    width: 200px;
}

.control_panel li {
}