html      { background:black;   color:white; text-align:center;}
h1        { font-size:4vw; display:inline;}
h2        { font-size:3vw; display:inline;}
table     { margin:auto; width:90%;}
svg       { background:#202020;}
#messages { background-color:yellow; font-size:16px; font-weight:bold; line-height:140%; }
#btn_sta  { font-size:24px;     color:white;  font-weight:bold;  line-height:140%;}
.connected{ background:lime;    color:black;}
.error    { background:red;     color:white;}
.sock6    { background:magenta; color:white;}
.sock4    { background:green;   color:white;}
.sock2    { background:orange;  color:black;}
.sock5    { background:blue;    color:white;}
.sock3    { background:yellow;  color:black;}
.sock1    { background:darkred; color:white;}
.warn     { background:orange;  color:black; font-weight:bold;}
.on       { background:lime;    color:black;}
.off      { background:red;     color:white;}
#voltage  { background:blue;    color:white;}
#frequency{ background:aqua;    color:black;}