.box25{
    position: relative;
    background: #fff0cd;
    box-shadow: 0px 0px 0px 5px #fff0cd;
    border: dashed 2px white;
    padding: 0.2em 0.5em;
    color: #454545;
}
.box25:after{
    position: absolute;
    content: '';
    right: -7px;
    top: -7px;
    border-width: 0 15px 15px 0;
    border-style: solid;
    border-color: #ffdb88 #fff #ffdb88;
    box-shadow: -1px 1px 1px rgba(0, 0, 0, 0.15);
}
.box25 p {
    margin: 0; 
    padding: 0;
}