body {
  margin: 0px;
  padding: 0px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

body main {
  min-height: 100vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

body main div #tablero {
  width: auto;
  height: auto;

}

body main div #tablero input {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 0px;
  width: 50px;
  height: 50px;
  text-align: center;
  outline: none;
  font-size: 1.7rem;
  border-width: 0px;
  color: #FFFF07;
  border: 1px solid #000000;
  cursor: pointer;
}

body main h1 {
  text-align: center;
  font-size: 2.5rem;
  color: #000000;
}

#spanError {
  padding: 15px;
  color: #E53935;
  font-size: 2rem;
  font-weight: bold;
}