.sert-block .preview {
    padding: 10px;
    position: relative;
}

.sert-block .preview:before {
    position: absolute;
    top: 0;
    left: 0;
    content: "";
    width: 20px;
    height: 20px;
    border-top: 2px solid #f24604;
    border-left: 2px solid #f24604;
}
.sert-block .preview:after{
    position: absolute;
    bottom: 0;
    right: 0;
    content: "";
    width: 20px;
    height: 20px;
    border-bottom: 2px solid #f24604;
    border-right: 2px solid #f24604;
}

.sert-block img {
    -webkit-box-shadow: 0 -5px 24px #d9dcdf;
    -moz-box-shadow: 0 -5px 24px #d9dcdf;
    box-shadow: 0 -5px 24px #d9dcdf;
}

.sert-block {
    display: block;
    color: #000 !important;
    text-decoration: none !important;
    font-family: RobotoLight;
}

.sert-block .title {
    font-family: RobotoRegular;
}