ty for the code. Sadly it didn’t help. It’s so weird, I set the whole css and config folder back to master-version and I still get a black screen. That are the only two folders I touched so far.
I think the only way I can fix this is to reinstall everything.

Hi,

I just started to customise my MagicMirror. Everything I did so far was setting it up and entering my location in the config.js. Everything was fine, the mirror worked.
Then I found this custom.css code in this forum, so I copy pasted it and replaced mine.

html {
  cursor: none;
  overflow: hidden;
}

::-webkit-scrollbar {
  display: none;
}

body {
  margin: 5px;
  position: absolute;
  height: calc(100% - 10px);
  width: calc(100% - 10px);
  background: #000;
  color: #fff;
  font-family: "Roboto Condensed", sans-serif;
  font-weight: 400;
  font-size: 2em;
  line-height: 1.5em;
  -webkit-font-smoothing: antialiased;
}

/**
 * Default styles.
 */

.dimmed {
  color: #666;
}

.normal {
  color: #fff;
}

.bright {
  color: #fff;
}

.xsmall {
  font-size: 10px;
  line-height: 15px;
}

.small {
  font-size: 15px;
  line-height: 20px;
}

.medium {
  font-size: 25px;
  line-height: 30px;
}

.large {
  font-size: 60px;
  line-height: 60px;
}

.xlarge {
  font-size: 70px;
  line-height: 70px;
  letter-spacing: -3px;
}

.thin {
  font-family: Roboto, sans-serif;
  font-weight: 100;
}

.light {
  font-family: "Roboto Condensed", sans-serif;
  font-weight: 300;
}

.regular {
  font-family: "Roboto Condensed", sans-serif;
  font-weight: 400;
}

.bold {
  font-family: "Roboto Condensed", sans-serif;
  font-weight: 700;
}

.align-right {
  text-align: right;
}

.align-left {
  text-align: left;
}

header {
  text-transform: uppercase;
  font-size: 15px;
  font-family: "Roboto Condensed";
  font-weight: 400;
  border-bottom: 1px solid #666;
  line-height: 10px;
  padding-bottom: 5px;
  margin-bottom: 10px;
  color: #999;
}

sup {
  font-size: 50%;
  line-height: 50%;
}

/**
 * Module styles.
 */

.module {
  margin-bottom: 20px;
}

.region.bottom .module {
  margin-top: 20px;
  margin-bottom: 0;
}

/**
 * Region Definitions.
 */

.region {
  position: absolute;
}

.region.fullscreen {
  position: absolute;
  top: -50px;
  left: -50px;
  right: -50px;
  bottom: -50px;
}

.region.right {
  right: 0;
}

.region.top {
  top: 0;
}

.region.top .container {
  margin-bottom: 15px;
}

.region.top .container:empty {
  margin-bottom: 0;
}

.region.top.center,
.region.bottom.center {
  left: 50%;
  -moz-transform: translateX(-50%);
  -o-transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  transform: translateX(-50%);
}

.region.top.right,
.region.top.left,
.region.top.center {
  top: 100%;
}

.region.bottom {
  bottom: 0;
}

.region.bottom .container {
  margin-top: 15px;
}

.region.bottom .container:empty {
  margin-top: 0;
}

.region.bottom.right,
.region.bottom.center,
.region.bottom.left {
  bottom: 100%;
}

.region.bar {
  width: 100%;
  text-align: center;
}

.region.third,
.region.middle.center {
  width: 100%;
  text-align: center;
  -moz-transform: translateY(-50%);
  -o-transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.region.upper.third {
  top: 33%;
}

.region.middle.center {
  top: 50%;
}

.region.lower.third {
  top: 66%;
}

.region.left {
  text-align: left;
}

.region.right {
  text-align: right;
}

.region table {
  width: 100%;
  border-spacing: 0;
  border-collapse: separate;
}

/*
 * CALENDAR SPECIFIC
 */

.fa.fa-calendar {
  color: #ff0000; /* Red */
}
.fa.fa-birthday-cake {
  color: #ff0000; /* Red */
}
.fa.fa-calendar-check-o {
  color: #ffff00; /* Yellow */
}

/*
 * WUFORECAST SPECIFIC
 */

.wuforecast .max-temp {
  font-size: 15px;
  line-height: 15px;
  color: #f66;
}

.wuforecast .min-temp {
  font-size: 15px;
  line-height: 15px;
  color: #0ff;
}

.wuforecast .weather-icon {
  font-size: 15px;
  line-height: 15px;
  color: #f93;
}

.wuforecast .day {
  font-size: 15px;
  line-height: 15px;
  color: #6f6;
}

/*
 * FORECAST
 */

.brightb {
color: #55acee;
}
.currentweather .wi-sunrise {
color: #ffd700;
}
.currentweather .wi-sunset {
color: #ffa500;
}
.currentweather .wi-day-sunny {
color: #ffff00;
}
.currentweather .wi-night-showers {
color: #55acee;
}
.currentweather .wi-degrees {
color: #415;
}
.currentweather .wi-rain {
color: #55acee;
}
.currentweather .wi-showers {
color: #55acee;
}
.currentweather .wi-night-showers {
color: #55acee;
}
.currentweather .wi-night-alt-cloudy-windy {
color: #aaa;
}
.currentweather .wi-night-cloudy {
color: #aaa;
}
.currentweather .wi-cloudy {
color: #aaa;
}
.currentweather .wi-day-cloudy {
color: #aaa;
}
.currentweather .wi-cloudy {
color: #aaa;
}
.currentweather .wi-cloudy-windy {
color: #aaa;
}
.currentweather .wi-showers {
color: #55acee;
}
.currentweather .wi-thunderstorm {
color: #ff00ff;
}
.currentweather .wi-snow {
color: #fff;
}
.currentweather .wi-fog {
color: #999;
}
.currentweather .wi-night-clear {
color: #fff;
}
.currentweather .wi-night-rain {
color: #55acee;
}
.currentweather .wi-night-thunderstorm {
color: #ff00ff;
}
.currentweather .wi-night-snow {
color: #fff;
}

.weatherforecast .wi-sunrise {
color: #ffd700;
}
.weatherforecast .wi-sunset {
color: #ffa500;
}
.weatherforecast .wi-day-sunny {
color: #ffff00;
}
.weatherforecast .wi-night-showers {
color: #55acee;
}
.weatherforecast .wi-degrees {
color: #415;
}
.weatherforecast .wi-rain {
color: #55acee;
}
.weatherforecast .wi-showers {
color: #55acee;
}
.weatherforecast .wi-night-showers {
color: #55acee;
}
.weatherforecast .wi-night-alt-cloudy-windy {
color: #aaa;
}
.weatherforecast .wi-night-cloudy {
color: #aaa;
}
.weatherforecast .wi-cloudy {
color: #aaa;
}
.weatherforecast .wi-day-cloudy {
color: #aaa;
}
.weatherforecast .wi-cloudy {
color: #aaa;
}
.weatherforecast .wi-cloudy-windy {
color: #aaa;
}
.weatherforecast .wi-showers {
color: #55acee;
}
.weatherforecast .wi-thunderstorm {
color: #ff00ff;
}
.weatherforecast .wi-snow {
color: #fff;
}
.weatherforecast .wi-fog {
color: #999;
}
.weatherforecast .wi-night-clear {
color: #fff;
}
.weatherforecast .wi-night-rain {
color: #55acee;
}
.weatherforecast .wi-night-thunderstorm {
color: #ff00ff;
}
.currentweather .wi-night-snow {
color: #fff;
}

After starting the mirror I had a black screen. So I deleted the code in the custom.css file and wrote body {} . As I remembered this was the code it was written in before.
But I still get a black screen, even deleting the code or deleting the file doesn’t help. Restarting didn’t help, too.

Any idea what I can do. Does someone has the old original custom.css code? Probably it wasn’t body {}.

Omg, yes finally! :D
First I followed this installation guide: https://forum.magicmirror.builders/topic/236/complete-setup-tutorial/3
I had the electron CPU issue. So I downgraded to electron version 1.4.15. The CPU usage went down from 90% to 70%. It was still laggy as hell.
I then formatted the microSD card and followed that youtube guide: https://www.youtube.com/watch?v=0Q04SKvibik
Downgraded to 1.4.15 again and now it’s running great with a CPU usage of like 5% with spikes to 50%, when there is an animation on the screen.

But I have one question.

After I finished the youtube tutorial I have the “MagicMirror” and the “mm”. Both autostart when I boot the raspberry pi.
Which use has the “mm”?

Which tutorial did you use?