.greenbox{background:#cfedb7; border: 2px solid #5ab80e;}

.box7{
    padding: 0.5em 1em;
    margin: 2em 0;
    color: #474747;
    background: whitesmoke;/*背景色*/
    border-left: double 7px #4ec4d3;/*左線*/
    border-right: double 7px #4ec4d3;/*右線*/
}
.box7 p {
    margin: 0; 
    padding: 0;
}

.box9 {
    padding: 0.5em 1em;
    margin: 2em 0;
    color: #ff7d6e;
    background: #ffebe9;
    border-top: solid 10px #ff7d6e;
}
.box9 p {
    margin: 0; 
    padding: 0;
}

.box20 {
    position: relative;
    padding: 0.25em 1em;
    margin: 2em 0;
    top: 0;
    background: #efefef;
}
.box20:before, .box20:after{ 
    position: absolute;
    top: 0;
    content:'';
    width: 10px;
    height: 100%;
    display: inline-block;
    box-sizing: border-box;
}
.box20:before{
    border-left: dotted 2px #15adc1;
    border-top: dotted 2px #15adc1;
    border-bottom: dotted 2px #15adc1;
    left: 0;
}
.box20:after{
    border-top: dotted 2px #15adc1;
    border-right: dotted 2px #15adc1;
    border-bottom: dotted 2px #15adc1;
    right: 0;
}
.box20 p {
    margin: 0; 
    padding: 0;
}