.contenedor {
    align-items: center;
    align-content: center;
    display: flex;
    flex-direction: column;
    margin: auto 0;
    text-align: center;
    width: 100%;
}

.elemento {
    width: 100%;
}

.campo {
    border: none;
    border-bottom: solid 3px lightblue;
    height: 35px;
    font-size: 18px;
    margin-top: 15px;
    width: 60%;
}

.campo:focus {
    background-color: lightcyan;
    border: none;
    border-bottom: solid 3px lightblue;
    font-weight: bold;
    outline: none;
}

.boton {
    font-weight: bold;
    margin-top: 15px;
    margin-left: 5px;
    height: 35px;
    width: 100px;
}