* {
  color-scheme: dark;
}

html {
  background: rgb(22 2 41);
}

body {
  margin: 0 20px;
  min-height: 300px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

nav.menu_block a {
  display: block;
}
div.menu {
  width: fit-content;
}

span.box {
  width: 100px;
  height: 100px;
  margin: 5px 0;
}

span.c {
  display: inline-block;
  background: red;
}

input {
  width: 300px;
  height: 50px;
}

b {
  background-color: coral;
  color: black;
  padding: 5px;
  font-size: 16px;
}

.inline {
  background: coral;
}
.block {
  background: seagreen;
}

mark {
  display: block;
  padding: 10px;
  margin-bottom: 5px;
  line-height: 1.5;
  background: rgb(43, 34, 51);
  color: aliceblue;
  text-align: justify;
}

.footer {
  text-align: center;
}

.break {
  display: inlinex;
  background: dodgerblue;
}