hr.style1 {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0));
}

hr.style2 {
    background-color: #2C3E5B;
    height: 15%;
}

hr.style3 {
    border: 0;
    height: 1px;
    background: #333;
    background-image: linear-gradient(to right, #ccc, #333, #ccc);
}

hr.style4 {
    border: 0;
    height: 1px;
    background: #333;
    background-image: linear-gradient(to right, #ccc, #333, #ccc);
}

hr.style20 {
    height: 30px;
    border-style: solid;
    border-color: silver;
    border-width: 1px 0 0 0;
    border-radius: 20px;
}

    hr.style20:before {
        display: block;
        content: "";
        height: 30px;
        margin-top: -31px;
        border-style: solid;
        border-color: silver;
        border-width: 0 0 1px 0;
        border-radius: 20px;
    }

hr.style21 {
    border-top: 3px double silver;
}