html - 使用 CSS 更改 HTML <form> 的宽度

Question

我在导航栏中有一个被表单包围的输入字段，我想将表单的大小减小到它当前所在容器宽度的 75% 左右。

当没有<form></form>时，输入正好是它所在容器大小的 75%，看起来很完美。

不完整的导航栏 HTML 代码:

<nav class="navbar fixed-top navbar-expand-lg navbar-dark">
        <div class="container" id="home">
            <form method="post">
                <div class="input-group md-form form-sm form-2 pl-0" id="search" method="post">
                    <input type="text" name ="search" id ="search" placeholder="Search Users" aria-label="Search" class="form-control my-0 py-1">
                    <div class="input-group-append">
                        <button class="btn btn-outline-secondary" type="submit" id="navbarButton"><i class="fas fa-search text-grey" aria-hidden="true"></i></button>
                    </div>
                </div>
            </form>
            <button class="navbar-toggler ml-auto" type="submit" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

我试过的 CSS 代码:

#search {
    max-width: 75%;
}

form {
    width: 75%;
}

无论屏幕宽度如何，表单都不会改变大小并保持相同的大小。

Answer 1

我觉得不错:

.container{
  width: 100%;
  background: tomato;
}

#search {
    max-width: 75%;
}

form {
    width: 75%;
  background: gray;
  margin: 0 auto;
}

<nav class="navbar fixed-top navbar-expand-lg navbar-dark">
        <div class="container" id="home">
            <form method="post">
                <div class="input-group md-form form-sm form-2 pl-0" id="search" method="post">
                    <input type="text" name ="search" id ="search" placeholder="Search Users" aria-label="Search" class="form-control my-0 py-1">
                    <div class="input-group-append">
                        <button class="btn btn-outline-secondary" type="submit" id="navbarButton"><i class="fas fa-search text-grey" aria-hidden="true"></i></button>
                    </div>
                </div>
            </form>
            <button class="navbar-toggler ml-auto" type="submit" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>