index.css

.title{
  font-family: arial, Sans-Serif;
  font-size: 20px;
  margin: 15px;
  text-align: center;
}

.headerX{
  background-color: #ee0000;
  border-radius: 5px;
  color: #bbbbff;
  font-weight: bold;
  text-align: center;
  box-shadow: 5px 5px 15px #888888;
  width: 100px;
}

.headerY{
  background-color: #0000ee;
  border-radius: 5px;
  color: #ff9999;
  font-weight: bold;
  text-align: center;
  box-shadow: -5px 5px 15px #888888;
  width: 100px;
}

.win{
  font-family: Arial, Sans-Serif;
  font-weight: bold;
  font-size: 20px;
  margin: 15px;
  text-align: center;
}

.restart{
  display: none;
}

.bar{
  text-decoration: none;
  display: flex;
  justify-content: center;
}

.cube {
  width: 50px;
  min-height: 50px;
  border: 2px solid #4f4f4f;
  text-align: center;
  font-family: Arial, Sans-Serif;
  font-size: 30px;
}

.navbar{
  color: #efeffb;
}

.img{
  border: 0.5px solid #888888;
  max-width: 150px;
  height: auto;
  border-radius: 5px;
}

.explain{
  width: 100%;
  height: 100%;
  background-color: rgba(18,21,27,1);
}

@media screen and (max-width: 1200px) and (min-width: 800px){
  .Mcards{
    display: none;
  }
}

@media screen and (max-width: 750px){
  .Ccards{
    display: none;
  }
  .headerX, .headerY{
    width: 80px;
    font-size: 12px;
  }
  h1{
    font-size: 21px;
  }
  h2{
    font-size: 18px;
  }
}