html {
    font-family: Arial, Helvetica, sans-serif;
    
}
div {
    display: table;
    margin: auto;
    padding-top: 1%;
}
.responsive-iframe {
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
}

.index{
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: 0.25rem;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

.btn-primary {
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
}

h1{
    font-size: 3em;
    letter-spacing: 1px;
    font-weight: bold;
    background: url('/background.png');
    --webkit-background-clip: text;
    background-clip: text;
    --webkit-text-fill-color: transparent;
    animation: text 7.5s linear infinite;
}

@keyframes text{
    from{background-position: 0% 50%;}
    to{background-position: 100% 100%;}
}