popup.css

body {
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    display: flex;
    align-items: center;
    width:600px;
    height: 200px;
    justify-content: center;
    flex-direction: column;
}

#timer {
    margin: 0;
    color: #111212;
    font-weight:200;


}
.btn-group {
    text-align: center;
    padding-top: 10px;
    line-height: 1.1;
}
.btn-group .btn1 {
    color: #606060;
    font-family: "Source sans pro", sans-serif;
    font-size: 14px;
    font-weight: 600;
    text-shadow: 0 1px #fff;
    border-radius: 20px;
    border: 1px solid #8f9092;
    transition: all 0.2s ease;
    background-image: linear-gradient(to top, #D8D9DB 0%, fff 80%, #FDFDFD 100%);
    padding: 4px;
    min-height: 30px;
    min-width: 80px;

}
.btn-group .btn2 {
    background-color: #454040;
    color: #ecf1ee;
    font-family: "Source sans pro", sans-serif;
    font-size: 13px;
    font-weight: 600;
    border-radius: 50%;
    border: 1px solid #202021;
    transition: all 0.2s ease;
    padding: 4px;

    min-height: 28px;
    min-width: 28px;



}