.dialog{
    text-align:center;
    margin:0;
}

.articles{
    display:inline-block;
    text-align:center;
    padding:0 7px;
    margin: 10px 0 5px;
    overflow: auto;
    max-height: calc(100vh - 90px);
}

.articles img{
    max-width: 100%;
    width: 100%;    /*needed for ie*/
}

.add-article{
    border: #63b32e solid 3px;
    float:none;
    background:#63b32e;
    padding:0;
    margin:0 15px 20px;
    display:inline-block;
    font-size:14px;
    font-weight: normal;
    min-width:108px;
}

.add-article>div{
    background:#63b32e;
    color:#fff;
    padding:5px 5px 3px;
}

.add-article:hover, .add-article:hover>div, .add-article:focus, .add-article:focus>div{
    background:#e6e6e6;
    border-color:#e6e6e6;
}

.add-article:hover>div, .add-article:focus>div{
    background:#e6e6e6;
}