.diagpt-header {
    width: 100%;
    height: 50px;
    text-align: center;
    background-color: rgb(0,84,139);
    position: absolute;
    line-height: 2.25em;
    font-size: 1.5em;
    font-weight: bold;
    color: white;
}

.diagpt-chat {
    position: absolute;
    bottom: 0;
    height: calc(100svh - 50px);
}