.search_box {
    display: flex;
    justify-content: center;
    margin: 5px 0;
}

.search_form {
    display: flex;
    width: 100%;
    max-width: 550px;
    /* 必要に応じて調整 */
}

#name {
    flex: 1;
    padding: 0 5px;
    height: 37px;
    border: 1px solid #ccc;
    border-right: none;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
    font-size: 1.8rem;
    /* サイズを適宜調整 */
    line-height: 1.2em;
}

button.search {
    display: inline-block;
    width: 80px;
    height: 39px;
    border: none;
    border-left: 1px solid #ccc;
    border-bottom-style: ridge;
    border-radius: 0 5px 5px 0;
    background-color: #dfe5ef;
    color: #343434;
    text-align: center;
    text-decoration: none;
    font-size: 2rem;
    /* サイズを適宜調整 */
    line-height: 0;
    cursor: pointer;
    transition: none;
}

button.search:hover {
    background-color: #c0c0c0;
}

input[name="name"]:focus {
    outline: none;
    background-color: #eafdff;
    box-shadow: none;
}