.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}
body,
html {
    width: 100%;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url(screenshots/screenshot11.PNG) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}
h1{
    font-size: 3rem;
    color: whitesmoke;
}
hr{
    border-color: rgb(104, 104, 104);
    border-width: 3px;
    max-width: 300px;
    padding-bottom: 12px;
}
.btn{
    font-weight: 700;
    border-radius: 300px;
    text-transform: uppercase;
}

.btn-xl{
    padding: 1rem 2rem;
}
.btn:hover{
    border-width: 5px;
}