style.css

article {
    display: flex;
    flex-direction: column;
    background-color: #FBEDDD;
}

.question {
    display: none;
}

#answer {
    display: none;
    width:300px;
    height: 200px;
    vertical-align: middle;
}

.input-div {
    vertical-align: middle;
}

.result {
    display: none;
}

.chat_title {
    margin-left: auto;
    margin-right: auto;
    margin-top: 55px;
    margin-bottom: 55px;
}

.white_box {
    width: 320px;
    background-color: white;
    margin-left: auto;
    margin-right: auto;
    border-radius: 10px;
    padding: 25px;
    font-size: 16px;
}

.keyword {
    margin-left: auto;
    margin-right: auto;
    font-size: 16px;
}

.save_btn {
    background-color: #E48F2A;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 34px;
    width: 320px;
    height: 56px;
    border: none;
    border-radius: 10px;
    font-size: 20px;
}

.bottom_menu {
    position: fixed;
    width: 100%;
    height: 70px;
    /* margin: 0 auto; */
    bottom: 0px;
    background-color: white
}

.bottom_menu>div {
    float:left;
    width: 20%;
    height: 100%;
    text-align: center;
    margin: 0 auto;
    padding-top: 20px;
}

.bottom_menu>div>img {
    float: center;
}

* {
    font-family: 'Song Myung', serif;
}