body {
    margin: 0;
    padding: 0;
    background-color: white;
    height: 100vh;
    overflow: hidden;
}

.corner {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: grey url('roh.png');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: bottom right;
}

img {
  max-width: 100%;
  height: auto;
}

* {
  box-sizing: border-box;
}

h1 {
  text-align: center;
}

.mainMenuBtn {
  background-color: #c1c1c1;
  border-radius: 5px;
  text-align: center;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: bold;
  font-size:3vw;
  text-decoration: none;
  padding: 20px;
  margin: 0.66%;
  float: left;
  width: 32%; /* The width is 20%, by default */
}

.old-text {
    color: #333; /* Tmavě šedá místo černé pro jemnější efekt */
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    opacity: 0.9; /* Lehce vybledlé */
    font-family: Arial, Helvetica, sans-serif;
}

.hidden-link {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0; /* Neviditelné tlačítko */
    cursor: pointer; /* Změní kurzor na ruku při najetí */
}

/* Use a media query to add a break point at 800px: */
@media screen and (max-width: 720px) {
  .mainMenuBtn {
    width: 100%; /* The width is 100%, when the viewport is 800px or smaller */
  }
}