sarasbakestudio, this is what I had to use for what you see on https://www.affirmationsofgod.com:
.sidebar #subbox, .sidebar #subbox1 {color: #24003B; font-size: 18px; line-height: 22px; border-radius: 5px; box-shadow: none; border: 0; background: #c6b9a2;}
.sidebar .enews-widget input[type="submit"] {
background: #24003b;
border: none;
box-shadow: none;
width: 100%;
border-radius: 5px; font-size: 22px; text-transform: uppercase; font-weight: bold;
}
.sidebar .enews-widget input:hover[type="submit"] {
opacity: 0.7;
transition: 0;
}
.enews ::-webkit-input-placeholder {
color: #24003B; opacity: 1;
}
.enews :-moz-placeholder { /* Firefox 18- */
color: #24003B; opacity: 1;
}
.enews ::-moz-placeholder { /* Firefox 19+ */
color: #24003B; opacity: 1;
}
.enews :-ms-input-placeholder {
color: #24003B; opacity: 1;
}