.captcha_box {
    width: 375px;
    margin: 0 auto;
    padding: 10px;
}

.captcha_box>.captcha_numero {
    width: 180px;
    height: 30px;
    float: left;
    position: relative;
    top: 2px;
    border: solid 1px #F1F1F1;
    border-bottom: solid 1px #CCC;
    border-right: solid 1px #CCC;
}

.captcha_box>.captcha_numero>img {
    float: left;
    width: 30px;
    height: 30px;
    border: none;
}

.captcha_box>.captcha_campo {
    width: 180px;
    height: 30px;
    line-height: 30px;
    font-size: 20px;
    float: right;
}

.captcha_box>.captcha_campo>input {
    width: 176px;
    height: 30px;
    line-height: 30px;
    font-size: 20px;
    float: right;
    border: solid 1px #F1F1F1;
    border-bottom: solid 1px #CCC;
    border-right: solid 1px #CCC;
    padding-left: 10px;
    text-align: center;
}

.captcha_box>.captcha_instrucoes {
    clear: both;
    padding: 15px 10px 10px 10px;
    font-size: 0.9em;
    font-style: italic;
    color: #2a334c;
    text-align: center;
}