表单输入和占位符不在Firefox中工作

Question

订阅表单有效，但占位符文字不可见，当您尝试输入时，您无法看到您正在键入的内容。适用于Chrome和Internet Explorer，但不适用于Firefox。

我已经在chrome和firefox

中包含了它的外观图像

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.nform .input-group .input {
  margin-bottom: 15px;
  height: 30px;
}
.nform .form-control {
  max-width: auto;
  margin: 1px;
  padding: 21px;
  font-weight: 300;
  color: #6a6a6a;
}
.form .input-group {
  margin-bottom: 15px;
}
.footer-distributed form {
  display: inline-block;
}
.footer-distributed form input,
.footer-distributed form textarea {
  display: block;
  border-radius: 3px;
  box-sizing: border-box;
  background-color: #fafafa;
  box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.1);
  border: none;
  resize: none;
  font: inherit;
  font-size: 14px;
  font-weight: normal;
  color: #969696;
  width: 280px;
  padding: 18px;
}
.footer-distributed::-webkit-input-placeholder {
  color: #5c666b;
}
.footer-distributed::-moz-placeholder {
  color: #00aaff;
  opacity: 1;
}
.footer-distributed:-ms-input-placeholder {
  color: #00aaff;
}
.footer-distributed form input {
  height: 20px;
  margin-bottom: 15px;
}
.footer-distributed form textarea {
  height: 75px;
  margin-bottom: 20px;
}
.footer-distributed form button {
  border-radius: 3px;
  background-color: #00bbff;
  color: #ffffff;
  border: 0;
  padding: 6px 40px;
  font-weight: 500;
  font-size: 18px;
  float: right;
  letter-spacing: 1px;
  height: 42px;
}
.footer-distributed form button:hover {
  border-radius: 3px;
  background-color: #ffffff;
  color: #00bbff;
  border: 1px solid #00bfff;
  padding: 6px 40px;
  font-weight: 500;
  float: right;
  letter-spacing: 1px;
  height: 42px;
}

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<div class="col-md-6 col-sm-6 col-xs-12">
  <div class=" subscribe-foot section-wrapper">
    <p class="subscribe-nowfoot">
      text
      <br>text
    </p>

    <div class="col-md-8 col-sm-8 col-xs-12 col-sm-push-2">
      <form class="nform">
        <div class="input-group">
          <input type="email" class="form-control border-radius" placeholder="Email address">
          <span class="input-group-btn">
    <button class="btn btn-form border-radius " type="button">Sign up</button>
    </span>
        </div>
      </form>
    </div>
  </div>
</div>

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