* {
    margin: 0;
    padding: 0;
    font-family: arial;
}
.clearfix {
    clear:both;
}
.margin_left {
    margin-left: 5%;
}
.margin_right {
    margin-right: 0;
}
#container {
    width: 100%;
    margin: 0 auto;
}
    header {
        width: 100%;
        background: url(images/header_background.jpg);
        background-size: auto;
        background-repeat: round;
        color: white;
    }
        header img {
            width: 80px;
            margin: 0 10px;
            float: left;
            border: 2px white solid;
        }
        header h1 {
            margin: 10px 0;
            font-size: 50px;
            float: left;
        }
        #left_header {
            padding: 20px 0;
            margin-left: 30px;
            float: left;
            cursor: default;
            transition: color 0.5s;
        }
        #left_header:hover {
            color: orange;
        }
        #right_header {
            float: right;
        }
            #right_header ul {
                list-style: none;
            }
            #right_header ul li {
                padding: 55px 45px;
                margin-top: 15px;
                float: left;
                font-size: 20px;
                font-weight: bold;
                transition: background 0.5s;
            }
            #right_header ul li:hover {
                background: orange;
            }
            #right_header a {
                color: inherit;
                text-decoration: none;
            }

    main{}
        #main_img {
            width: 100%;
            height:100%;
        }
        .firstsec {
            padding: 0 5%;
        }
            .firstsec h2 {
                padding: 50px;
                text-align: center;
                font-size: 50px;
                color: grey;
                text-shadow: 1px 1px 5px black;
            }
            article {
                width: 20%;
                margin: 10px 6% 10px 0;
                float: left;
                color: #666;
            }
                article img {
                    align-self: center;
                    width: 150px;
                    height: 100px;
                    padding-left: 46px;
                    animation: img_anim 5s;
                    animation-iteration-count: infinite;
                }
                    .img_block {
                        height: 100px;
                    }

                .article_title {
                    text-align: center;
                    font-size: 20px;
                    font-weight: bold;
                    margin: 10px;
                }
                .article_description {
                    /*white-space: nowrap;*/
                    overflow: hidden;
                    text-overflow: ellipsis;
                }
        .secondsec {
            width: 100%;
            height: 100%;
            padding: 50px 0;
            box-sizing: border-box;
            background: url(images/img4.jpg);
            background-size: 100%;
        }
            .secondsec h2 {
                text-align: center;
                color: white;
                font-size: 50px;
                margin-bottom: 40px;
            }
                .secondsec h2:hover {
                    text-decoration: line-through;
                    cursor: default;
                }
            #leftside {
                width: 40%;
                margin-left: 5%;
                float: left;
            }
                #leftside img {
                    width: 100%;
                    height: 80%;
                    border: 5px solid white;
                    border-radius: 40px;
                    animation: img_rotate linear 5s;
                    animation-iteration-count: infinite;
                }
            #rightside {
                width: 40%;
                margin-right: 5%;
                float: right;
                color: white;
                background: #00000090;
                padding: 20px;
                border: 5px solid white;
                border-radius: 40px;
            }
                #rightside p {
                    line-height: 46.5px;
                }
                #rightside h3 {
                    text-align: center;
                    font-size: 40px;
                    margin-top: 40px;
                }
        footer {
            width: 100%;
            background: url(images/header_background.jpg);
            color: white;
        }
        #left_footer {
            padding: 20px;
            float: left;
        }
        #right_footer {
            padding: 20px;
            float: right;
        }
            #right_footer ul {
                list-style: none;
            }
                #right_footer ul li {
                    float: left;
                    padding: 0 10px;
                    font-size: 20px;
                    font-weight: bold;
                    transition: color 0.5s;
                }
                #right_footer ul li:hover {
                    color: orange;
                    cursor: pointer;
                }
                #right_footer a {
                    color: inherit;
                    text-decoration: none;
                }
/* @keyframes img_anim {
    0% {-webkit-filter: saturate(100%);}
    50% {height: 400px; -webkit-filter: saturate(300%);}
    100% {-webkit-filter: saturate(100%);}
}
@keyframes img_rotate {
    from {transform: rotate(0deg);}
    to {transform: rotate(360deg);}
}