.problem-box{
    width: 1000px;
    max-width: 100%;
    display: block;
    margin: 0 auto;
    padding: 30px 0;
}

.problem-list{
    width: 100%;
    display: block;
    margin-bottom: 10px;
    border-bottom: 1px solid #bbbbbb;
    position: relative;
}
.problem-title-icon{
    width: 20px;
    height: 20px;
    line-height: 18px;
    font-size: 18px;
    color: #FFF;
    text-align: center;
    border-radius: 50%;
    background-color: #73c0cb;
    position: absolute;
    top: 2px;
    left: 0;
}
.problem-title-icon2{
    width: 20px;
    height: 20px;
    line-height: 18px;
    font-size: 18px;
    color: #FFF;
    text-align: center;
    border-radius: 50%;
    background-color: #e96363;
    position: absolute;
    top: 2px;
    left: 0;
    display: none;
}
.problem-title-box.active .problem-title-icon{
    display:none;
}
.problem-title-box.active .problem-title-icon2{
    display: block;
}
.problem-title{
    padding-left: 30px;
    display: block;
    font-size: 18px;
    letter-spacing: 1px;
    padding-bottom: 10px;
    transition: all .3s linear;
    cursor: pointer;
}

.problem-info-box{
    width: 100%;
    text-align: justify;
    box-sizing: border-box;
    font-size: 16px;
    color: #555;
    line-height: 2;
    padding-top: 10px;
    padding-bottom: 20px;
    padding-left: 30px;
    letter-spacing: 1px;
}