table, th, td {
    border: 5px solid white;
    border-collapse: collapse;
}

button {
    width: 160px;
    height: 120px;
    background: lightgray;
    font-size: 20px;
}

.mqtttopics tr td {
    border: 1px solid black;
    width: 100%;
    font-size: 20px;
}

.arttitel {
    font-size: 50px;
}

.arbtn {
    width: 150px; 
    height: 30px; 
    font-size: 20px;
}
 
.artxt {
    font-size: 25px;
}