html {
    position: relative;
    min-height: 100%;
}
body{
    background-image: url("background_obj.jpg");
    font-family: 'Libre Baskerville', serif;
    margin: 15px 15px 100px 15px;
}

h1{
    font-size: 5em;
    color: #f1f1f1;
}

h2 {
    font-size: 1.17em;
}

  /* Style the tab */
.tab {
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}

/* Style the buttons that are used to open the tab content */
.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
}

/* Change background color of buttons on hover */
.tab button:hover {
    background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
    background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
    display: none;
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-top: none;
    background-color: #f1f1f1;
}
 footer {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    text-align: center; color:white
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
}