问在link_to内部Rails 4中对颜色进行样式化，但内联样式显示不正确

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<%= link_to "Sign In", new_user_session_path, :method => :get, style: "color:white" %>
<h3>Read More - <%= link_to 'Article', action: :articles, style: "color: purple" %></h3>
<%= link_to 'Click to Read More About What People Are Saying About Us', action: :articles %>

body {
  background-color: #fff;
  color: #333;
  font-family: verdana, arial, helvetica, sans-serif;
  font-size: 13px;
  line-height: 18px;
}

p, ol, ul, td {
  font-family: verdana, arial, helvetica, sans-serif;
  font-size: 13px;
  line-height: 18px;
}

pre {
  background-color: #eee;
  padding: 10px;
  font-size: 11px;
}

a {
  color: #000;
  &:visited {
    color: #666;
  }
  &:hover {
    color: #fff;
    background-color: #000;
  }
}

div {
  &.field, &.actions {
    margin-bottom: 10px;
  }
}

#notice {
  color: green;
}

.field_with_errors {
  padding: 2px;
  background-color: red;
  display: table;
}

#error_explanation {
  width: 450px;
  border: 2px solid red;
  padding: 7px;
  padding-bottom: 0;
  margin-bottom: 20px;
  background-color: black;
  h2 {
    text-align: left;
    font-weight: bold;
    padding: 5px 5px 5px 15px;
    font-size: 12px;
    margin: -7px;
    margin-bottom: 0px;
    background-color: #c00;
    color: #fff;
  }
  ul li {
    font-size: 12px;
    list-style: square;
  }
}

<a data-method="get" href="/users/sign_in" style="color:white">Sign In</a>


<h3>Read More - <a href="/articles?style=color%3A+purple">Articles</a></h3>
<a href="/articles">Click to Read More About What People Are Saying About Us</a>