style.css

:root {
  --selection-bg: red;
}

body {
  text-align: center;
  margin: 0px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 20px;
}
.blocklyDiv , #code {
  margin: 0px;
}

#code {
  float: right;
  width: 29%;
  height: 99vh;
  max-width: 29%;
  max-height: 99vh;
  resize: none;
  border: none;
}

#code::selection {
  background: var(--selection-bg);
}
#code::-moz-selection { /* dla Firefox */
  background: var(--selection-bg);
}

#logo {
  position: relative;
  animation-name: down;
  animation-duration: 4s;
}

a:link {
  color: #e22319;
  background-color: transparent;
  text-decoration: none;
}

a:visited {
  color: brown;
  background-color: transparent;
  text-decoration: none;
}

a:hover {
  color: black;
  background-image: linear-gradient(45deg, silver, white, silver);
  text-decoration: none;
}

a:active {
  color: blue;
  background-color: transparent;
  text-decoration: underline;
}

.footer {
  /*text-decoration: overline;*/
}