thank you so much!
and this is the applied code (if anyone may need it):
<!-- Blurry -->
<a style="top:200px;">
<div style="
position:fixed;
top:0px;
left:-5%;
margin: 0%;
padding: 100%;
background-color: rgb(0 0 0 / 50%);
backdrop-filter: blur(4px);">
</style></div></a>
<!-- Box -->
<div style =" position: fixed;
top: 280px;
width: 94%;
max-width:680px;
opacity: 1;
margin-left: -5px;
height:210px;
background: white;
border-radius: 10px;
padding-top: 1%;
padding-left: 7%;
padding-right: 7%;
box-shadow: rgb(0 0 0 / 15%) 0px 4px 10px;
text-align: center;
z-index:0 !important;"
>
<!-- Text-->
<br>
<h2><font color=#000>メールを追加</h2>
Follow us!
<pre><span><style>
[data-test="app-button-view"] {
position: fixed;
top: 438px;
margin-left: calc(5% - 10px);
width: 40%;
max-width: 200px;
}
[data-test="app-text-field"] {
position: fixed;
top: 380px;margin-left: calc(8% - 10px);
width: 100%;
max-width: 400px;
}
.fab-target >* {
display:none;
}
</style></span></pre>