.button-vision {
    position: relative;
    display: inline-block;
    border: 1px solid #bfbfbf;
    width:32px;
    height:28px;
    line-height:32px;
    box-sizing:border-box;
    border-radius:4px;
    background: transparent url('/img/icon_eye.svg') no-repeat center center;
    background-size: 20px auto;
    text-decoration:none;
}

.button-vision:hover {
    text-decoration:none;
    box-shadow: 0 2px 1px #cccccc;
    background-color: #ffffff;
    background-image: url('/img/icon_eye_hover.svg');
}

.button-vision:hover::before {
    content: '';
    position: absolute;
    left: 50%;
    margin-left:-10px;
    bottom: -10px;
    border: 10px solid transparent;
    border-bottom: 10px solid #bfbfbf;
}

.button-vision:hover::after {
    content: 'Версия для людей с ограничением по зрению';
    display:inline-block;
    background:#FFF;
    top:0;
    margin-top:32px;
    position: absolute;
    border: 1px solid #bfbfbf;
    width:316px;
    height:28px;
    left:50%;
    margin-left:-158px;
    box-sizing:border-box;
    border-radius:4px;
    text-align:center;
    padding: 0 5px 0 5px;
    line-height:28px;
    color: #333333;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 12px;
    z-index:1001;
}

.button-accessible-environment {
    display:inline-block;
    position: relative;
    border: 1px solid #bfbfbf;
    padding: 0 5px 0 5px;
    height:28px;
    line-height:28px;
    box-sizing:border-box;
    color: #333333;
    background-color: transparent;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 12px;
    border-radius:4px;
}

.button-accessible-environment:hover {
    text-decoration: none;
    box-shadow: 0 2px 1px #cccccc;
}

.button-unvision {
    position: relative;
    display: none;
    border: 1px solid #bfbfbf;
    padding: 0 5px 0 5px;
    height:28px;
    line-height:28px;
    box-sizing:border-box;
    color: #333333;
    background-color: transparent;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 12px;
    border-radius:4px;
}

.button-unvision:hover {
    text-decoration: none;
    box-shadow: 0 2px 1px #cccccc;
}