.enviomaterial {
}

    .enviomaterial .textos {
        width: 45%;
        margin-right: 30px;
    }

    .enviomaterial .aviso {
        width: 50%;
    }

    .enviomaterial .box {
        border: solid 1px;
        padding: 30px;
        width: 500px;
    }

        .enviomaterial .box h4 {
            background-color: red;
            color: #fff;
            padding: 15px;
            margin-left: -20px;
            margin-right: -20px;
            margin-top: -20px;
            text-transform: uppercase;
        }

.container {
    width: 100%;
    max-width: 100%;
}