#baslik {
    color: rgb(255, 255, 255);
    text-align: center;
    font-size: 100px;
    font-family: Arial, Helvetica, sans-serif;
    font-style: bold;
}
#musteri_yorumlari {
    color: rgb(255, 255, 255);
    text-align: center;
    position: relative;
    bottom: 50px;
    font-family: Arial, Helvetica, sans-serif;
    font-style: italic;
    font-size: 20px;
    font-weight: bold;
    filter: blur(10px);
    display: table;
    margin: 0 auto 0 auto;
}
#border {
    background-color: #5ab138;
    
    border-radius: 20px;
    border-style: outset;
    border-width: 5px;
    border-color: rgb(231, 231, 231);
    padding: 15px;
    text-shadow: #ff6a00;
    text-shadow: 2px 2px 3px #00000065;
}
#ozlusoz {
    font-family: Arial, Helvetica, sans-serif;
    font-style: italic;
    font-size: 20px;
    text-align: center;
    position: relative;
    top: -15px;
}
#tum_videolar {
    text-align: center;
}
#video__1 {
    display: inline-block;
    *display: inline;
}
#video__2 {
    display: inline-block;
    *display: inline;
}
#video__3 {
    display: inline-block;
    *display: inline;
}
#video__4 {
    display: inline-block;
    *display: inline;
}
#video__5 {
    display: inline-block;
    *display: inline;
}
#video__6 {
    display: inline-block;
    *display: inline;
}
#video__7 {
    display: inline-block;
    *display: inline;
}
#video__8 {
    display: inline-block;
    *display: inline;
}
#video__1,
#video__2,
#video__3,
#video__4,
#video__5,
#video__6,
#video__7,
#video__8 {
    border: ;
    border-width: ;
    border-radius: ;
}
body {
    background-color: #0d0d0d;
    position: relative;
    bottom: 40px;
    
}
#profilephoto {
    width: 8%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    bottom: 54px;
    border-radius: 50%;
    border: solid white;
    box-shadow: 0em 0em 30px rgb(255, 75, 75);
}
#Jason_P {
    color: rgb(46, 53, 255);
    text-shadow: none;
    font-size: 15px;
}
#Cory_Z {
    color: rgb(46, 53, 255);
    text-shadow: none;
    font-size: 15px;
}
#formore {
    color: rgb(255, 255, 255);
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    
    background-color:#51515180;
    border-radius: 10px;
    display: table;
    margin: 0 auto 0 auto;
    padding: 2px;
    
}
<!DOCTYPE html>
<html lang="en">
<head>
    <link rel="stylesheet" href="index.css">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Mirza Sahin </title>
    
</head>
<body>
    
    <h1 id="baslik">Mirza Sahin</h1>
    <br>
    <img src="/Profile Photo.jpg" alt="Mirza Sahin" id="profilephoto">
    <br><br>
    <div id="musteri_yorumlari">
        <div id="border">
            <div id="yorum">"Mirza was amazing to work with. His attention to detail and skill level is the top 1% on
                Upwork.<br> Well done will def use again!"<br><span id="Jason_P">Jason P. / United States</span></div>
            <br>
            <div id="yorum">"Mirza is incredible with anything video. He takes my terrible videos, works his magic, and
                creates a masterpiece. <br>Would highly recommend!" <br><span id="Cory_Z">Cory Z. / Canada</span></div>
        </div>
    </div>
    <div id="tum_videolar">
        <div id="video__1">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/509719836?h=6ae2aadcb5" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
        <div id="video__2">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/636505933?h=e048a335e6" width="640"
                height="340" frameborder="0" allowfullscreen>
            </iframe>
        </div>
        <br><br><br>
        <div id="video__3">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/645523495?h=c198f0dedd" width="640"
                height="340" frameborder="0" allowfullscreen>
            </iframe>
        </div>
        <div id="video__4">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/567036624?h=4ce12ce017" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
        <br><br><br>
        <div id="video__5">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/714396313?h=28b0205e0f" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
        <div id="video__6">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/714090413?h=0d265ce8f0" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
        <br><br><br>
        <div id="video__7">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/626411112?h=faf989f7d4" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
        <div id="video__8">
            <iframe title="vimeo-player" src="https://player.vimeo.com/video/695168003?h=1f4f9749bd" width="640"
                height="340" frameborder="0" allowfullscreen></iframe>
        </div>
    </div>
    <br>
    <h1 id="formore">
        <a href="https://vimeo.com/mirzasahin" id="clickhere" style="text-decoration: none; color: #5ab138;"
            target="_blank" alt="Vimeo Account">Click here</a> for more works
    </h1>
    
</body>
</html>
I want to give a blur effect to the green area in the background. But since the background is the background of a text, that is, a whole, when I want to blur the background, a blur effect is also added to texts. I don't want to add blur to text, just want to add background. Or is there a code to exclude texts with blur effect? Like ";none"