h1{
    margin-top: 20px;
    color: #fff;
}

.cttn-bttn{
    display: flex;
    margin: 0 auto;

    justify-content: center;
}

body{
    background: url(testWeb/img/bg-bttn.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    margin: 0;
}

.bttn{
    padding: 15px;
    background: rgba(0,0,0,.5);
    margin: 20px;
    color: #fff;
    border: 1px solid #fff;
    transition: 0.3s ease;
}

.bttn:hover{
    background: rgba(0,0,0,.8);
}