.p-teaser {
    position: relative;
    display: block;
    width: 468px;
    max-width: 100%;
    margin: 40px auto;
    background-size: 100%;
    box-shadow: 0 0 0 1px #eee 
}
.p-teaser img {
    width: 100%;
    height: auto;
    display: block;
}