* {
    margin: 0;
    padding: 0;
}

header {
    width: 100%;    
    height: 95px;
    background: black;
    opacity: 0.9;
}

header img {
    width: 100px;
    height: 75px;
    padding: 5px !important;
    margin-left: 20px;
    box-shadow: 2px 2px 5px green;
    z-index: 3000;
}

header ul {
    display: block;
    float: right;
    padding-right: 80px;
    padding-top: 25px;
}

header ul li {
    display: inline-block;
    margin-right: 15px;
    font-family: "Marcellus", sans-serif;
    font-weight: 400;
    font-size: 16px;
    color: #fff;
    z-index: 2000;
}

header ul li a {
    color: #fff;
    text-decoration: none;
}

header ul li a:hover {    
    color: green;
    font-weight: 800;
    font-weight: bold;
}

.differ button {
    background: rgb(109, 7, 109);
    color: #fff;
    padding: 8px;
    border-radius: 15px;  
    border: none;      
    box-shadow: 1px 1px 5px #fff;
}

.differ button:hover {
    background: black;
    color: #fff;
}

/* Banner CSS */

.head-part {
    background-image: url("../rdcm.jpg");
    width: 100%;
    height: 650px;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    opacity: 0.95;
}

.banner-text h4 {
    text-align: center;
    margin-top: 200px;
    color: #fff;
    font-weight: 600;
    font-size: 55px;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    letter-spacing: 15px;
    line-height: 70px;
    text-shadow: 2px 3px 8px black;
}

.banner-text p {
    margin-top: 20px;
    text-align: center;
    color: rgb(179, 27, 98);
    font-size: 30px;
    font-weight: 700;
    font-family: Arial, Helvetica, sans-serif;
    letter-spacing: 3x;
    text-shadow: 2px 5px 8px black;
}

.button-link {
    width: 75%;
    margin: 0 auto;
}

.button-link button {
    width: 450px;
    padding: 20px;
    border-radius: 50px;
    margin: 40px 0 0 15px;
    background: rgb(15, 15, 15);
    opacity: 0.8;
    color: #fff;
    border: 3px solid #fff;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
}

.button-link button:hover {
    color: green;
    background: black;
    border: 2px solid green;
}

.know-rdcm {
    width: 100%;
    margin: 40px 0 30px 0;
}

.know-rdcm h3 {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 56px;
    text-align: center;
    font-weight: 900;
    line-height: 56px;
}

.know-rdcm-p p {
    width: 80%;
    text-align: center;
    margin: 0 auto 30px auto;
    line-height: 25px; 
    font-family: Verdana, Geneva, Tahoma, sans-serif;   
    font-size: 18px;
    font-weight: 400;
}

.rdcm-main-column {
    width: 90%;
    margin: 60px auto 0 auto;
}

.rdcm-main-column-1 {
    width: 360px;
    height: 580px;
    background: #F1F1F1;
    /* border: 1px solid grey; */
    margin: 0 30px 30px 0;
}

.rdcm-main-column-1 img {
    width: 358px;
    height: 250px;
}

.rdcm-main-column-1 h4 {
    text-align: center;
    margin-top: 25px !important;
    font-weight: 700;
}

.rdcm-main-column-1 p {
    text-align: center;
    line-height: 28px;
}

.main-video {
    width: 80%;
    margin: auto;
}

.main-video video {
    width: 100%;
}