ul {
    list-style: none;
    /*убираем маркеры списка*/
    margin: 0;
    /*убираем верхнее и нижнее поле, равное 1em*/
    padding-left: 0;
    /*убираем левый отступ, равный 40px*/
}

a {
    text-decoration: none;
    /*убираем подчеркивание текста ссылок*/
}

body {
    background: white
}

IMG.center {
    display: flex;
    position: relative;
    margin-left: auto;
    margin-right: auto;
    margin-top: 3%;
    border-color: white;
    align-items: center;
}

/*
@import url('https://fonts.googleapis.com/css?family=Roboto');

.top-menu {
    background: rgba(255, 255, 255, .5);
    box-shadow: 3px 0 7px rgba(0, 0, 0, .3);
    padding: 20px;
}

.top-menu:after {
    content: "";
    display: table;
    clear: both;
}

.navbar-logo {
    display: inline-block;
}

.menu-main {
    list-style: none;
    margin: 0;
    padding: 0;
    float: right;
}

.menu-main li {
    display: inline-block;
}

.menu-main a {
    text-decoration: none;
    display: block;
    position: relative;
    line-height: 61px;
    padding-left: 20px;
    font-size: 18px;
    letter-spacing: 2px;
    font-family: 'Arimo', sans-serif;
    font-weight: bold;
    color: #18c0f8;
    transition: .5s linear;
}

.menu-main a:before {
    content: "";
    width: 9px;
    height: 9px;
    background: #0472f8;
    position: absolute;
    left: 50%;
    transform: rotate(45deg) translateX(6.5px);
    opacity: 0;
    transition: .5s linear;
}

.menu-main a:hover:before {
    opacity: 1;
}

@media (max-width: 660px) {
    .menu-main {
        float: none;
        padding-top: 20px;
    }

    .top-menu {
        text-align: center;
        padding: 20px 0 0 0;
    }

    .menu-main a {
        padding: 0 10px;
    }

    .menu-main a:before {
        transform: rotate(45deg) translateX(-6px);
    }
}

@media (max-width: 600px) {
    .menu-main li {
        display: block;
    }
}
*/

        @import url('https://fonts.googleapis.com/css?family=Roboto');
    
        .top-menu {
            position: relative;
            background: rgb(255, 255, 255);
        }
    
        .menu-main {
            list-style: none;
            margin: 0;
            padding: 0;
        }
    
        .menu-main:after {
            content: "";
            display: table;
            clear: both;
        }
    
        .left-item {
            float: left;
        }
    
        .right-item {
            float: right;
        }
    
        .navbar-logo {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }
    
        .menu-main a {
            text-decoration: none;
            display: block;
            line-height: 80px;
            padding: 0 20px;
            font-size: 18px;
            letter-spacing: 2px;
            font-family: 'Roboto', Arial, Helvetica, sans-serif;
            font-weight: bold;
            color: rgb(0, 132, 255);
            transition: .3s linear;
        }
    
        .menu-main a:hover {
            background: rgba(17, 17, 17, 0.484);
            color: azure;
        }
    
        @media (max-width: 830px) {
            .menu-main {
                padding-top: 90px;
                text-align: center;
            }
    
            .navbar-logo {
                position: absolute;
                left: 50%;
                top: 10px;
                transform: translateX(-50%);
            }
    
            .menu-main li {
                float: none;
                display: inline-block;
            }
    
            .menu-main a {
                line-height: normal;
                padding: 20px 15px;
                font-size: 16px;
            }
        }
    
        @media (max-width: 630px) {
            .menu-main li {
                display: block;
            }
        }