body {
    background-image: url("math.webp");
    background-repeat: no-repeat;
    background-size: cover;
    margin: 0;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    position: absolute;
}
.text {
    text-align: center;
}
button {
    margin-left: calc(50% - 2em);
    background-color: gray;
    color: white;
    border: 1px solid black;
    border-radius: 0.3em;
    margin-bottom: 1em;
    margin-top: 1em;
    padding: 0.5em;
    box-shadow: 0 0.2em black;
    transition: 100ms;
    display: block;
    text-decoration: none;

  }
  button:hover {
    background-color: darkgray;
    padding: 10px;
    box-shadow: 0 0px 5px rgb(189, 186, 193);
  }
  button:active {
    transform: translateY(0.1em);
    background-color: lightgray;
    box-shadow: 0 0.1em black;
    
  }

h1, h3{
    text-shadow: 0px 0px 3px white, 0px 0px 3px white, 0px 0px 3px white, 0px 0px 3px white, 0px 0px 3px white, 0px 0px 3px white, 0px 0px 3px white;
}
h2 {
    text-shadow: 0px 0px 3px orange, 0px 0px 3px orange, 0px 0px 3px orange, 0px 0px 3px orange, 0px 0px 3px orange, 0px 0px 3px orange, 0px 0px 3px orange;
}