* {
    margin:0;
    padding:0;
    box-sizing:border-box;
}
body{
    font-family:Arial, Helvetica, sans-serif;
    background:#f4f4f4;
    color:#222;
}
header{
    background: linear-gradient(to left, #5f8dee, #2c10aa);
    color:white;
    padding:18px;
}
nav{
    margin-top:15px;
}

nav a{
    color:white;
    text-decoration:none;
    margin-right:20px;
    font-size:16px;
}
nav a:hover{
    /*text-decoration:underline;*/
    color:yellowgreen;
    font-weight: 800;
}
/*img{
    display: block;
    width:50%;
    border-radius:12px;
   margin: auto;
}
img:hover{
    transform: translateY(-4px);
}*/

#background-container {
    width: 100%;
    min-height: 100vh;
    /*background-image: url("../images/initial-image.jpg");*/
    background-size: cover;
    background-position: center;
    transition: background-image 1s ease-in-out;
}
iframe {
    display: block;
    margin: 50px auto;
}

/*#slide{
    position: fixed;
    width: 600px;
    height: auto;

    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    opacity: 1;
    transition: opacity 1s ease-in-out;
}*/