pleshevski.ru/static/styles.css

*, ::before, ::after {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

html {
  background-color: #eee;
}

html, body {
  height: 100%;
}

#root {
  min-height: 100vh;
  align-items: stretch;
}

#root, #main {
  display: flex;
  flex-direction: column;
}

#main, .content {
  flex: 1 0;
}