问youtube嵌入链接和图像之间的空格-我看不出它来自哪里？

EN

*reset.css*

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video, button {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}


*main.css*
html {
    height: 100%;
    overflow-x:hidden;
}

@font-face {
    font-family: 'Proxima Nova';
    src: url("../fonts/Proxima\ Nova\ Bold.woff");
}

@font-face {
    font-family: 'Proxima Nova Thin';
    src: url("../fonts/Proxima\ Nova\ Thin.woff");
}

body {
    background-color: #00558c;
    font-family: 'Proxima Nova', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif !important;
    text-rendering: optimizeLegibility;
    background-color: #0b101a !important;
    color: #fff;
    width: 100%;
    height: 100%;
}

.container-site {
    background-color: #0b101a !important;
}

.nav-index {
    height: 100%;
}

.custom-color {
    color: #FF7700 !important;
}

.nav-link {
    font-size: 1.4rem !important;
}

.navbar-custom {
    font-weight: bold;
}

.logo-carabella {
    width: 9rem;
}

.logo-erasmus {
    width: 9rem;
}

.float-right {
    float: right;
}

.welcome-index {
    height: 47rem;
    position: relative;
}

.navbar {
    -webkit-border-radius: 0 0 2.5rem 2.5rem;
    -moz-border-radius: 0 0 2.5rem 2.5rem;
    border-radius: 0 0 2.5rem 2.5rem;
}

::-webkit-scrollbar {
    width: 6px;
    background-color: #0b101a;
}

::-webkit-scrollbar-track {
    display: none;
}

::-webkit-scrollbar-thumb {
    background-color: #FF7700;
    width: 10px;
}

.jumbotron-custom {
    background-color: transparent !important;
    color: #fff;
}

.lead-font {
    font-family: 'Proxima Nova Thin', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif !important;
}

.jumbotron-fluid {
    z-index: 9999;
}

.container {
    position: relative;
    z-index: 9999;
}

.container-text-robot {
    padding-top: 8rem;
}

.index-modificat-2 {
    z-index: 1;
    top: 20;
}

.index-modificat {
    position:absolute;
    top:0;
    left: 0;
    width:100%;
    z-index: -1;
}

.video-prezentare {
    text-align: center;
    color: #fff;
}

.text-robot-1 {
    width: 47rem;
}

.text-robot-2 {
    width: 34rem;
}

.circuit-video {
    width: 1024px;
}

#video-changer {
    width: 600px;
    height: 250px;
    position: relative;
}

.hard-drive {
    width: 100%;
    position: absolute;
    top: 0;
    right: -600px;
    z-index: 1;
}

.cd-video {
    width: 65%;
    position: absolute;
    top: 3%;
    right: -405px;
    z-index: 2;
}

.slider-hard {
    width: 50%;
    position: absolute;
    top: 4%;
    right: -590px;
    z-index: 3;
}

.sageata-change {
        width: 2.5%;
        position: absolute;
        bottom: -60%;
        right: -592px;
        transform: rotate(180deg);
        z-index: 3;
        cursor: pointer;
}

.sageata-change-stanga {
    width: 2.5%;
    position: absolute;
    bottom: -60%;
    right: -23px;
    z-index: 3;
    cursor: pointer;
}

.container-site-fara-nav {
    width: 1366px;
    margin: 0 auto;
}

.instructor-sageti {
    position: absolute;
    top: 50%;
    left: 35%;
    width: 20rem;
}

.rotate-back {
    transition: all 1s ease-in-out;
 }
 
 .rotate-fwd {
    transition: all 1s ease-in-out;
 }

@media only screen and (min-width: 768px) {
    .navbar-brand {
        margin-left: 2rem;
    }
    .navbar-custom {
        position: absolute;
        left: 50%;
        transform: translatex(-50%);
    }
    .navbar-custom > li {
        margin: 0 4rem;
    }
}

@media only screen and (max-width: 767px) {
    .logo-carabella {
        display: none;
    }
    .logo-erasmus {
        display: none;
    }
    .nav-link {
        font-size: 1rem !important;
    }
}

@media only screen and (min-width: 768px) and (max-width: 1100px) {
    .navbar-custom > li {
        margin: 0 2rem;
    }
}

@media only screen and (min-width: 768px) and (max-width: 940px) {
    .navbar-custom > li {
        margin: 0 1rem;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link href="css/reset.css" type="text/css" rel="stylesheet">
    <link href="css/css.css" type="text/css" rel="stylesheet">
    <link href="css/bootstrap.min.css" type="text/css" rel="stylesheet">
    <title>Made4Europe</title>
</head>
<body>
    <div id="container-site">
        <section class="nav-index">
            <nav class="navbar navbar-expand-md navbar-light bg-light">
                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
                  <span class="navbar-toggler-icon"></span>
                </button>
                <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
                  <a class="navbar-brand" href="#"><img src="img/logo.png" class="logo-carabella"></a>
                  <ul class="navbar-nav navbar-custom mr-auto mt-2 mt-lg-0">
                    <li class="nav-item active">
                      <a class="nav-link custom-color" href="#">Acasa<span class="sr-only">(current)</span></a>
                    </li>
                    <li class="nav-item">
                      <a class="nav-link custom-color" href="#">Lectii</a>
                    </li>
                    <li class="nav-item">
                      <a class="nav-link custom-color" href="#">Teste</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link custom-color" href="#">Detalii</a>
                    </li>
                  </ul>
                    <ul class="navbar-nav ml-auto">
                        <li class="nav-item">
                            <a class="nav-link" href="#"><img src="img/logo-erasmus.png" class="logo-erasmus"></a>
                        </div>
                  </ul>
                </div>
              </nav>
        </section>
        <div class="container-site-fara-nav">
        <section class="welcome-index">
            <div class="jumbotron jumbotron-fluid jumbotron-custom text-center">
                <div class="container">
                  <div class="container-text-robot">
                    <img src="img/text.png" class="text-robot-1"/>
                    <img src="img/text 2.png" class="text-robot-2"/>
                  <object data="svg/Robot 1.svg" type="image/svg+xml" class="index-modificat"></object>               
                </div>
                </div>
            </div>
        </section>
        <section class="video-prezentare">
          <iframe width="1024" height="768" src="https://www.youtube.com/embed/4OH3JZyLVJE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
          <div id="wrapper-video-circuit">
            <img src="img/video.png" class="circuit-video">
          </div>
          <div id="video-changer">
            <img src="img/hard-drive.png" class="hard-drive">
            <img src="img/cd.png" class="cd-video">
            <img src="img/slider-hard.png" class="slider-hard">
            <img src="img/sageata.png" class="sageata-change">
            <img src="img/sageata.png" class="sageata-change-stanga">
            <img src="img/instructor.png" class="instructor-sageti">
          </div>
        </section>
    </div>
  </div>
    <script src="js/jquery.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
    <script src="js/main.js"></script>
</body>
</html>