.popup-form {
position: fixed;
top: 50vh;
left: 50vw;
transform: translate(-50%, -50%);
background-color: lightgrey;
padding: 20px;
border: 1px solid black;
z-index: 9999;
}

.close-button {
position: absolute;
bottom: 10px;
right: 10px;
}