.caixa {
    padding: 20px;
    border-radius: 5px;
    border: 1px solid rgba(0,0,0,.2);
    box-shadow: 0 0 20px rgba(0,0,0,.2);
    margin-top: 25%;
    background-color: #fff !important;
    z-index: 99;
}

.formRow {
    position: relative;
    width: 100%;
    border-color: transparent;
    padding: 0;
    margin: 0;
}

.formRow--item {
    display: block;
    width: 100%;
}

.formRow--input {
    background-color: transparent;
    position: relative;
    padding: 15px 0 11px;
    width: 100%;
    outline: none;
    border-bottom: 1.5px solid rgba(0,0,0,.3);
    border-left: transparent;
    border-right: transparent;
    border-top: transparent;
    letter-spacing: .2px;
    font-weight: 400;
    font-size: 16px;
    resize: none;
    -webkit-transition: all .2s ease;
    transition: all .2s ease;
}

.formRow--input-wrapper {
    position: relative;
    display: block;
    width: 100%;
}

    .formRow--input-wrapper.active .placeholder {
        top: -5px;
        background-color: transparent;
        color: rgba(0,0,0,.5);
        font-size: 11px;
        -webkit-transform: translateY(0);
        transform: translateY(0);
        font-family: sans-serif;
    }

.formRow .placeholder {
    position: absolute;
    top: 50%;
    left: 10px;
    display: block;
    color: rgba(0,0,0,.5);
    white-space: nowrap;
    letter-spacing: .2px;
    -webkit-transition: all, .2s;
    transition: all, .2s;
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
    pointer-events: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    font-family: sans-serif;
    font-weight: 600;
    font-size: 14px;
}

.vamos_mudar_um_pouco {
    height: 100%;
    width: 100%;
    border-radius: 0;
    border: 2px solid rgba(0,0,0,.2);
    background-color: #5a667c;
    cursor: pointer;
    color: #fff;
    text-shadow: 2px 2px 10px rgba(255,255,255,.5);
}