body {
     font-family: Arial, sans-serif;
     text-align: center;
     color: black;
     background-image: url('background.png');
     background-repeat: no-repeat;
     background-size: cover;
     background-position: center;
     background-attachment: fixed;
     margin: 0;
     padding: 0;
     }

#title {
     color: black;
     }

#memu {
     color: blue;
     font-size: 25px;
     }

#text {
     color: black;
     font-size: 20px;
     }

#a {
  width: 40%;
  padding-left: 0.5rem;
  margin-left: 0.5rem;
  float: right;
  box-shadow: inset 5px 0 5px -5px black;
  color: black;
}

#a > span {
  margin: 0.5rem;
}

#b {
  width: 40%;
  padding-left: 0.5rem;
  margin-left: 0.5rem;
  float: left;
  box-shadow: inset -5px 0 5px -5px black;
  color: black;
}

#b > p {
  margin: 0.5rem;
}

span {
     color: black;
     font-size: 25px;
     }
p {
     color: black;
     font-size: 20px;
     }