Efecto Hover con CSS3 ideal para tus anuncios en Blogger (Primera Forma)

.contenedor {
    position:relative;
    width:680px;
    margin: 0 auto;
}
.vista {
    width: 278px;
    /*ancho*/
    height: 231px;
    /*alto*/
    margin:-5px;
    float: left;
    border: 10px solid #fff;
    overflow: hidden;
    position: relative;
    text-align: center;
    -webkit-box-shadow: 1px 1px 2px #e6e6e6;
    -moz-box-shadow: 1px 1px 2px #e6e6e6;
    box-shadow: 1px 1px 2px #e6e6e6;
    cursor: default;
    background: #fff url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirR8Je2aB6ek5H0wxGivYpgIdjFX3CJFj3_Xffq05lDlhepzcoJpVvmEJFTRuS0aPmKHDGDeWSiWE2V181RJeloHhUy6J9SIiVGrDgPcLWlTreS9fFgm2m_tms5dU_eXJNCWNAeoBAW3M/s300/bgimg.jpg) no-repeat center center;
}
.vista .mascara, .vista .content {
    width: 278px;
    height: 231px;
    position: absolute;
    overflow: hidden;
    top: 0;
    left: 0;
}
.vista img {
    display: block;
    position: relative;
}
.vista h2 {
    font-family:"wf_SegoeUILight", "Segoe UI Light", "Segoe WP Light", "wf_SegoeUI", "Segoe UI", "Tahoma", Arial, Verdana, sans-serif;
    text-transform: uppercase;
    color: #fff;
    text-align: center;
    position: relative;
    font-size: 20px;
    font-weight:bold;
    padding: 10px;
    background: rgba(0, 0, 0, 0.8);
    margin: 20px 0 0 0;
}
.vista p {
    font-family:"wf_SegoeUILight", "Segoe UI Light", "Segoe WP Light", "wf_SegoeUI", "Segoe UI", "Tahoma", Arial, Verdana, sans-serif;
    font-size: 16px;
    position: relative;
    color: #fff;
    padding: 10px 20px 20px;
    text-align: center;
}
.vista a.info {
    font-family:"wf_SegoeUILight", "Segoe UI Light", "Segoe WP Light", "wf_SegoeUI", "Segoe UI", "Tahoma", Arial, Verdana, sans-serif;
    font-weight:bold;
    display: inline-block;
    text-decoration: none;
    padding: 7px 14px;
    background-color: rgba(0, 0, 0, 0.5);
    background-image: -webkit-linear-gradient(rgba(255, 255, 255, .5), rgba(255, 255, 255, 0));
    background-image: -moz-linear-gradient(rgba(255, 255, 255, .5), rgba(255, 255, 255, 0));
    background-image: -ms-linear-gradient(rgba(255, 255, 255, .5), rgba(255, 255, 255, 0));
    background-image: -o-linear-gradient(rgba(255, 255, 255, .5), rgba(255, 255, 255, 0));
    background-image: linear-gradient(rgba(255, 255, 255, .5), rgba(255, 255, 255, 0));
    color: #fff;
    text-transform: uppercase;
    -webkit-box-shadow: 0 0 1px #000;
    -moz-box-shadow: 0 0 1px #000;
    box-shadow: 0 0 1px #000;
    border-radius:6px;
}
.vista a.info: hover {
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;
}
.imagen_efecto img {
    width: 278px;
    /*ancho*/
    height: 231px;
    /*alto*/
    -webkit-transition: all 0.2s linear;
    -moz-transition: all 0.2s linear;
    -o-transition: all 0.2s linear;
    -ms-transition: all 0.2s linear;
    transition: all 0.2s linear;
}
.imagen_efecto .mascara {
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    opacity: 0;
    background-color: rgba(26, 145, 236, 0.6);
    -webkit-transition: all 0.4s ease-in-out;
    -moz-transition: all 0.4s ease-in-out;
    -o-transition: all 0.4s ease-in-out;
    -ms-transition: all 0.4s ease-in-out;
    transition: all 0.4s ease-in-out;
}
.imagen_efecto h2 {
    -webkit-transform: translateY(-100px);
    -moz-transform: translateY(-100px);
    -o-transform: translateY(-100px);
    -ms-transform: translateY(-100px);
    transform: translateY(-100px);
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    opacity: 0;
    -webkit-transition: all 0.2s ease-in-out;
    -moz-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    -ms-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
}
.imagen_efecto p {
    -webkit-transform: translateY(100px);
    -moz-transform: translateY(100px);
    -o-transform: translateY(100px);
    -ms-transform: translateY(100px);
    transform: translateY(100px);
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    opacity: 0;
    -webkit-transition: all 0.2s linear;
    -moz-transition: all 0.2s linear;
    -o-transition: all 0.2s linear;
    -ms-transition: all 0.2s linear;
    transition: all 0.2s linear;
}
.imagen_efecto:hover img {
    -webkit-transform: scale(1.1, 1.1);
    -moz-transform: scale(1.1, 1.1);
    -o-transform: scale(1.1, 1.1);
    -ms-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
}
.imagen_efecto a.info {
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    opacity: 0;
    -webkit-transition: all 0.2s ease-in-out;
    -moz-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    -ms-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
}
.imagen_efecto:hover .mascara {
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=100)";
    filter: alpha(opacity=100);
    opacity: 1;
}
.imagen_efecto:hover h2, .imagen_efecto:hover p, .imagen_efecto:hover a.info {
    -ms-filter:"progid: DXImageTransform.Microsoft.Alpha(Opacity=100)";
    filter: alpha(opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -o-transform: translateY(0px);
    -ms-transform: translateY(0px);
    transform: translateY(0px);
}
.imagen_efecto:hover p {
    -webkit-transition-delay: 0.1s;
    -moz-transition-delay: 0.1s;
    -o-transition-delay: 0.1s;
    -ms-transition-delay: 0.1s;
    transition-delay: 0.1s;
}
.imagen_efecto:hover a.info {
    -webkit-transition-delay: 0.2s;
    -moz-transition-delay: 0.2s;
    -o-transition-delay: 0.2s;
    -ms-transition-delay: 0.2s;
    transition-delay: 0.2s;
}