.form {
    max-width: 700px;
    margin: 32px auto 0 auto;
    padding: 0 16px;
}

.form_item {
    border-top: 1px solid #ddd;
    padding: 24px 0 0 0;
    margin: 0 auto 24px auto;
}

.form_item:nth-child(6) {
    border-bottom: 1px solid #ddd;
}

.form_item_label {
    margin: 0 0 16px 0;
}

.form_item_label span {
    display: inline-block;
    border: 1px solid #000;
    border-radius: 10px;
    font-size: 1.4rem;
    margin: 0 0 0 16px;
    padding: 0 8px;
}

.form_item_input {
    width: 100%;
}

.form_item_textarea {
    width: 100%;
    height: 200px;
    margin: 0 0 16px 0;
}

.form_btn {
    display: block;
    border: 1px solid var(--text_color);
    background-color: #fff;
    width: 240px;
    line-height: 48px;
    text-align: center;
    margin: 0 auto 40px auto;
    transition: 0.4s;
}

@media screen and (min-width:768px) {
    .form_btn:hover {
        background-color: var(--text_color);
        color: #fff;
    }
}

/*===========min-width:768px===========*/