body {
    background-image: url(../imagens/bg-repeat.jpg);
    background-size: auto 100%;
    background-repeat: repeat-x;
    background-position: center;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.principal {
    width: 100%;
    max-width: 48rem;
    min-height: 25rem;
    display: flex;
    align-items: center;
    justify-content: center;   
}

.cabecalho {
    width: 300px;
    height: 111px;
    margin-right: 2rem;
}

.titulo {
    color: #fff;
    font-size: 20px;
}

.texto {
    color: #fff;
    font-weight: 300;
    font-size: 15px;
}

.formulario {
    width: 100%;
    max-width: 340px;
    min-height: 378px;
    background-color: #FFFFFF;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.campo {
    border-radius: 5px;
    width: 100%;
    border: 1.6px solid #000000;
    padding-left: 7px;
}

input.campo {
    height: 2.2rem;
}

textarea.campo {
    resize: none;
    height: 6rem;
    padding-top: 8px;
}

.mensagem-alerta {
    font-size: 8px;
    color: red;
    top: 2px;
    margin-bottom: 5px;
    visibility: hidden;
    position: relative;
}

.nome-usuario,
.email,
.telefone {
    display: flex;
    flex-direction: column;
}

.botao {
    color: #fff;
    background-color: #3CCC87;
    margin-top: 8px;
    height: 2.5rem;
    border-radius: 5px;
    border: none;
}

.erro {
    border: 1.6px solid red;
}

.sucesso {
    border: 1.6px solid green;
}