OctoprintKlipperPlugin/octoprint_klipper/static/css/klipper.css

.plugin-klipper-log {
   padding: 3px;
   overflow-y: scroll;
   height: 400px;
   border: 1px solid #eee;
}

.plugin-klipper-log .log-item {
   margin: 2px auto 0 auto;
   border: 1px solid #ddd;
   border-radius: 3px;
   background-color: #eeeeef;
}

.plugin-klipper-log .error {
   color: #b94a48;
}

.plugin-klipper-log .log-item .ts {
   display: inline-block;
   width:  13%;
   height: 100%;
   vertical-align: top;
   font-size: 0.8em;
   padding: 3px;
}

.plugin-klipper-log .log-item .msg {
   display: inline-block;
   width: 84%;
   height: 100%;
}

.clear-btn {
   margin-top: 6px;
}