html,
body {
  height: 100%;
  background: url(../images/background.jpg);
  text-align: center;
}

.jumbotron{
    background: rgba(0,0,0,0.9);
    color: green;
    padding-top: 0;
    margin-top:10%;
    text-align: center;
    height: 100%;
    align-items: center;
}

#wrapper {
    width: 960px;
    height: 95%;
    box-sizing: border-box;
    margin: 2.5% auto;
}

h1 {
    padding-top: 5%;
    font-family: Geo, sans-serif;
    font-size: 4em;
    font-weight: bold;
    color: whitesmoke;
}

button {
    display: block;
    width: 50%;
    height: 20%;
    margin: 20px auto;
    font-size: 42px;
    cursor: pointer;
    border: 0;
}

button:hover {
    background:gold;
    border: 2px solid blue;
}

.clickMe:hover{
    background-color: lightslategray;
}

img {
    height: 200px;
}