how can i control the last line in paragraph using css

.container{
    width: 300px;
    height: 300px;
    margin: 50px auto;
}
.back{
    width: 100%;
    height: 100%;
    background-color: green;
    padding: 10px;
    box-sizing: border-box;
    border-radius: 20px;
    font-size: 30px;
    overflow: hidden;
    text-overflow: ellipsis;
}

 <div class="container">
      <div class="back face">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Dignissimos
        eaque vitae praesentium eius facilis quos ipsa minima quae quasi beatae
        oditvoluptates ipsam qui consequatur, corporis eos odio esse
        consectetur?
      </div>
    </div>