Module:Message box/style.css

.box
{
    border: solid black 1px;
    border-left: solid black 10px;
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
}

.box .left
{
    height: 40px;
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-grow: 1;
}

.box .left span
{
    margin: 0;
    padding-left: 10px
}

.box .left h4
{
    margin: 0;
}

.box .right
{
    flex-grow: 20;
    align-items: center;
}

.box .right p
{
    margin: 0;
}