.content_box {
    background-color: #666;
    padding:30px;
    box-sizing: border-box;
}
.content_box > .box_header {
    margin-bottom: 30px;
}
.content_box > .box_header > h3 {
    color:#fff;
    font-size: 18px;
    letter-spacing: -1px;
    font-weight: 400;
    line-height: 24px;
}

.content_box > form {
    width:100%;
}
.content_box > form >label {
    width:100%;
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}
.content_box > form > label > input,
.content_box > form > label > textarea {
    display: block;
    width:90%;
    margin:0;
    padding:10px;
    box-sizing: border-box;
}
.content_box > form >label> span {
    background-color: #fff;
    padding: 5px;
    box-sizing: border-box;
    width:8%;
    max-height: 30px;
    display: inline;
    text-align: center;
}

.content_box > form > .btn_box {
    display: flex;
    justify-content: right;
    margin-top:20px;
}
.content_box > form > .btn_box > button {
    padding:8px 10px;
    box-sizing: border-box;
    border:none;
    outline: none;
}

.content_box > form > .btn_box > button:first-child {
    margin-right: 10px;
    background-color: blue;
    color:#fff;
}

@media screen and (max-width:1200px) {
    .content_box {
        padding:15px;
    }
    .content_box > .box_header {
        margin-bottom:15px;
    }
    .content_box > .box_header > h3 {
        font-size:16px;
    }   
    .content_box > form >label> span {
        font-size:14px;
    }
}

@media screen and (max-width:650px) {
    .content_box > form >label> span {
        display: none;
    }
    .content_box > .box_header > h3 {
        font-size:14px;
        letter-spacing: -1.2px;
    } 
    .content_box > form > label > input,
    .content_box > form > label > textarea {
        width:100%;
    }
}