body{
    margin:0;
    background:#000;
    font-family:Arial, Helvetica, sans-serif;
}

.about{
    position:absolute;

    top:35px;
    left:40px;

    color:white;

    font-size:22px;

    text-decoration:underline;

    cursor:pointer;
}

.container{

    display:flex;

    justify-content:center;

    align-items:center;

    height:100vh;
}

.briefcase{

    width:750px;

    max-width:90%;
}

.popup{

    position:fixed;

    top:0;
    left:0;

    width:100%;
    height:100%;

    background:rgba(0,0,0,0.65);

    display:none;

    justify-content:center;
    align-items:center;
}

.popup-box{

    background:#1b1b1b;

    color:white;

    width:420px;

    padding:35px;

    border-radius:12px;

    text-align:center;

    box-shadow:0 0 35px rgba(0,0,0,.7);
}

.popup-box h2{

    margin-top:0;
}

.popup-box button{

    margin-top:20px;

    padding:10px 22px;

    cursor:pointer;
}

.briefcase-container{
    position: relative;
    display: inline-block;
}

.enter-button{
    position: absolute;

    width:40px;

    left:347px;
    top: 285px;

    cursor:pointer;
}