* {
    margin: 0;
    padding: 0;
}
fieldset{
    width: 80%;
    margin:0 auto;
    text-align: center;
    border-radius: 10px;
    height: 50px;
    padding: 10px;
}
.form_title {
    color: red;
    font-weight: bold;
    font-size: 20px;
}
.detail {
    position: absolute;
    top: -50px;
    background-color: #fff;
    z-index: 5;
    font-size: 12px;
    width: 120px;
    height: 30px;
    padding: 5px;
    border: 1px solid #666;
    border-radius: 8px;
    visibility: hidden;
}
.select_city {
    margin-left: 50px;
    margin-right: 10px;
}
#aqi-chart-wrap {
    display: flex;
    overflow: hidden;
    box-sizing: border-box;
    height: 550px;
    padding: 0 60px;
    align-items: flex-end;
    justify-content: space-around;
}
.chat_item {
    animation: move_In 1s;
    position: relative;
    display: inline-block;
    bottom: 0;
    width: 100px;
    flex-direction: row;
    background-color: red;
    flex-wrap: wrap;
    cursor: pointer;
    box-shadow: 1px 1px 1px #999;
    margin: 1px;
}
@keyframes move_In {
    0% {
        bottom: -100%;
    }
    100% {
        bottom: 0;
    }
}