html, body {
    height: 100%;
    overflow: hidden;
    margin: 0;
}

.attention-container {
    background-color: black;
    height: 100%;
    color: white; 
    text-align: center;
}

.attention-message-container {
    position: relative;
    height: calc(100% - 175px);
    max-height: calc(100% - 175px);
    overflow: hidden;
}

.attention-message-inner {
    position: absolute;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    transform: translateY(-50%);
    width: 100%;
    max-height: 100%;
}

.attention-message {
    padding: 20px;
    font-size: 40px;
}

.details-container {
    position: absolute;
    bottom: 40px;
    width: 100%;
}

.details {
    padding: 0 20px;
    font-size: 14px;
}

/**unlocked messages**/
.messages {
    background-color: #f6f6f6;
    height: 100%;
    font-family: robotoregular;
    overflow-y: auto;
}

.message-groups {
    padding: 10px;
}

.message-teacher {
    font-family: robotomedium;
    padding: 5px 0;
}

.message {
    background-color: white;
    font-family: robotoregular;
    padding: 7px;
    border-top: none;
    border-right: 1px solid #909090;
    border-left: 1px solid #909090;
    border-bottom: 1px solid #B9B9B8;
    font-size: small;
}

.messages-list .message:first-child {
    border-top: 1px solid #909090;
}
.messages-list .message:last-child {
    border-bottom: 1px solid #909090;
}
.messages-list .message .message-text {
    word-wrap: break-word;
}
.linkified {
    color: #32b4e5;
}

.linkified:hover, .linkified:focus {
    color: #1789b4;
}

.nopadding {
    padding-right: 0;
    padding-left: 0;
    padding-top: 0;
    padding-bottom: 0;
}

.ack-btn {
    background-color: #2ca6dd;
    color: white;
    border: none;
    font-family: robotoregular;
    padding: 2px 14px;
}

.ack-btn:hover {
    color: white;
    background-color: #2792C2;
    outline: 0;
}

.ack-btn:focus {
    color: white;
    outline: 0;
}