.common-questions {
    margin-bottom: 20px;
}

.common-question {
    display: block;
    width: 80%;
    margin: 6px 0;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
    background-color: #007bff;
    color: #fff;
    border: none;

}

.common-question:hover {
    background-color: #0056b3;
}

.qa-form {
    margin-bottom: 15px;
}

textarea {
    width: 100%;
    height: 60px;
    margin-bottom: 10px;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.interactive-qa {
    margin-bottom: 20px;
}


.header {
    display: block;
    width: 100%;
    margin: 5px 0;
    padding: 8px;
    background-color: #0066ff;
    border-radius: 5px;
    position: relative;
}

.header .hide {
    width: 50px;
    border-radius: 50%;
    border: 1px solid #fff;
    text-align: center;
    font-size: 35px;
    line-height: 50px;
    color: white;
    margin: 15px;
    cursor: pointer;
}

.center {
    width: 100%;
    margin: 5px 0;
    padding: 8px;
    height: 100%;
    border-radius: 4px;
    top: 10%;
    max-height: 550px;
    cursor: pointer;
    border: none;
    background: rgba(0, 0, 0, 0);;
    overflow: auto;
}

.bottom {
    position: absolute;
    /* initial position */
    text-align: center;
    top: 40%;
    left: 5%;
    right: 5%;
    /* keep .bottom above .center */
    z-index: 1;
}

#tit {
    margin: 0 auto;
    display: block;
}


.bottom #sendContent {
    height: 90px;
    width: 100%;
    margin: 5px 0;
    border-radius: 4px;
    padding: 8px;
    border: none;
    border-top: 1px solid #ddd;
    outline: medium;
}

.bottom .footer {
    height: 40px;
    cursor: pointer;
}

.footer span {
    margin-left: 10px;
    text-decoration: underline;
    font: 14px/40px Microsoft YaHei;
}

.footer button {
    float: right;
    margin-right: 20px;
    width: 100px;
    height: 36px;
    font-size: 18px;
    background-color: #0066ff;
    border-radius: 5px;
    border: none;
    color: #fff;
    cursor: pointer;
    box-shadow: 0px 0px 5px #000;
}

.footer button:hover {
    box-shadow: 0px 0px 8px 2px #000;
}

.center .robot {
    width: 100%;
    color: #ff6600;
}

.center .person {
    float: right;
    text-align: right;
    width: 100%;
}