body {
    height: 500px; /* You must set a specified height */
    background-position: top; /* Center the image */
    background-repeat: no-repeat; /* Do not repeat the image */
    background-size: cover; /* Resize the background image to cover the entire container */
}

a.miboton:link, a.miboton:visited, a.miboton:hover, a.miboton {
    background-color: #5ab8a7;
    color: white;
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    font-weight: bold;
    width: 100%;
    margin-bottom: 30px;
}

.btn_tausv {
    background-color: #5ab8a7;
    color: white;
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    font-weight: bold;
    width: 100%;
    border-color: #5ab8a7;
}