.box{
 
 width: 75%;
  height: auto;
    text-align: left;

    padding: 0.5em 1em;
    margin: 2em 0;
    color: #474747;
    background: #fffff0;/*背景色*/
    border-left: double 7px #4ec4d3;/*左線*/
    border-right: double 7px #4ec4d3;/*右線*/
}
.box p {
    margin: 0; 
    padding: 0;
}