*, *:before, *:after{ padding: 0; margin: 0; box-sizing: border-box; } body{ background-color: #0855ae; } .popup{ background-color: #ffffff; width: 420px; padding: 30px 40px; position: absolute; transform: translate(-50%,-50%); left: 50%; top: 50%; border-radius: 8px; display: none; font-family: "Poppins",sans-serif; text-align: center; }