CSS Help To animate a sliding door

You can try adding <pre><span><style> before @keyframe, maybe. :grinning_face_with_smiling_eyes:
Sorry, it takes a lot of effort to understand English. @L.M

<div style =" position: fixed;
animation: slidedissolve 3s;
animation-fill-mode: forwards;
top: 35px; 
width: 99%;
height: 93%;
left: 3%;
max-width: 680px;
opacity: 30;
margin-left: -10px;
background-color: rgba(143, 96, 114, 0.3); 
backdrop-filter: blur(10px);
border-radius: 16px;
padding-top: 1%;
padding-left: 7%;
padding-right: 7%;
box-shadow: 0 4px 30px pink;
rgba(0, 0, 0, 0.1);
text-align: center;
z-index:-1 !important;"
border: 1px solid rgba(143, 96, 114, 1);
}
<pre><span><style>
@keyframes slidedissolve {
  from {left: 0px; opacity:1;}
  to {left: -400px; opacity:0.1; }
}
>
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