.head_container {
    padding: 10px;
    /* 画面デザインでFlex-Boxを使用する場合はこれをコンテナに指定*/
    display: flex;
    /* 両端に揃える時はspace-between, 左揃えはflex-start, 右揃えはflex-end*/
    justify-content: space-between;

}

.head_item{
    display: flex;
}

.title_string {
 /*   font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;*/
    font-size: 26px;
    padding-left: 8px;
    color: rgb(226, 152, 73);
}

header img {
    margin: 3px;
}

header {
    width: 100%;
    height: 50px;

    background-color: bisque;
}
header ul {
    list-style-type: none;
    font-size: 12px;
}

header ul li {
    display: inline-block;
}

.main_container {
    width: 100%;
    height: 600px;
    background-color: bisque;

    margin: 0px auto;
    display: flex;
    /* align-itemsは縦方向の位置指定、横方向はjustify-content*/
    align-items: center;
}

.left-content {
    width: 50%;
    font-size: 20px;
    font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
    font-weight: bold;
    color: rgba(8, 26, 17, 0.351);
    padding: 30px;
    align-items: center;
}

#attention {
    font-size: 10px;
}

.form_island {
    width: 350px;
    height: 400px;
    border-radius: 20px;
    background-color: white;

    box-shadow: 4px 4px 0px 0px burlywood;

    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
}

.fm_item01 {
    width: 80%;
/*    border: 1px solid black; */
    font-size: 18px;
    font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
    font-weight: bold;
    color: gray;
}

.fm_item02 {
    width: 80%;
 /*    border: 1px solid black; */
    font-size: 16px;
    font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
    font-weight: bold;
    color: gray;
}

.fm_item03 {
    width: 180px;
    height: 60px;
    border-radius: 8px;
    background-color: green;

    font-size: 16px;
    font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
    font-weight: bold;

    color: white;
    text-align: center;
    line-height: 60px;

    box-shadow: 3px 3px 0px 0px rgb(11, 92, 11);
    user-select: none;
}

.fm_item03:active {
    margin-top: 2px;
    box-shadow: 1px 1px 0px 0px rgb(3, 52, 3);
} 

#email {
    width: 95%;
    height: 40px;
    font-size: medium;
    line-height: 30px;
    border: 1px solid rgb(190, 190, 190);
    border-radius: 6px;
    align-self: center;

    box-shadow: inset 1px 1px 1px rgba(90, 90, 90, 0.5); /* 内側の影 */
}

#code {
    width: 95%;
    height: 40px;
    font-size: medium;
    line-height: 30px;
    border: 1px solid rgb(190, 190, 190);
    border-radius: 6px;
    align-self: center;

    box-shadow: inset 1px 1px 1px rgba(90, 90, 90, 0.5); /* 内側の影 */
}

#keisan {
   color: gray;
   font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
}

#number {
   color: gray;
   font-size: large;
   font-weight: bold;
   font-family: Helvetica, Arial, "hiragino kaku gothic pro", meiryo, "ms pgothic", sans-serif;
}

.foot {
   color: red;
   font-size: 8px;
}


/* max-width以下の場合はこちらのStyleを適用 */
@media screen and (max-width: 600px) {
  
    .title_string {
	font-size: 24px;
    } 

    .main_container {
        height: 800px;
        flex-direction: column;
    }

    .left-content {
	margin-top: 10px;
        width: 85%;
        padding: 10px;
    }
    
    .form_island {
        height: 450px;
    }
}