html - 为什么提交按钮的宽度小于其他输入字段的宽度？

Question

我创建了这个注册表单。所有字段都应该是相同的长度。但是，由于某种原因，提交按钮的宽度比输入字段的宽度窄，即使我对所有输入字段都应用了 350 像素的宽度。以下是注册表单的代码：

:root {
    --main-color: #00308f;
    --secondary-color: #7cb9e8;
    --dark-color: #444;
    --light-color: #fafafa;
}

body {
    font-family: Montserrat,sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    text-align: justify;
    margin-top: 70px;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 0;
    padding: 1em;
}

.button {
    margin: 0 .5em;
    border-radius: .5em;
    padding: .5em 1.25em;
    font-weight: 700;
    min-width: 80px;
}

.button-submit {
    margin: 1.25em 0 0;
    padding: .6em 1.25em;
    width: 100%;
    background-image: linear-gradient(-45deg,var(--main-color),var(--secondary-color),var(--secondary-color),var(--secondary-color),var(--main-color));
    border: solid 1.5px var(--main-color);
    color: var(--main-color);
}

.button-submit:hover {
    background-image: linear-gradient(-45deg,var(--secondary-color),var(--main-color),var(--main-color),var(--main-color),var(--secondary-color));
    border: solid 1.5px var(--secondary-color);
    color: var(--light-color);
    transition-duration: .4s;
}

.input-field {
    margin: .5em 0;
    border: solid 1px var(--secondary-color);
    border-radius: .5em;
    padding: 0 1em;
    height: 35px;
}

.registration-field {
    width: 350px;
}

.registration-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

@media screen and (max-width:565px) {
    body {
        margin-top: 130px;
    }
}

<form class="registration-form">
      <h2>Create an account</h2>
      <input
        class="input-field registration-field"
        type="text"
        name="name"
        placeholder="Name"
      />
      <input
        class="input-field registration-field"
        type="email"
        name="email"
        placeholder="Email"
      />
      <input
        class="input-field registration-field"
        type="password"
        name="password"
        placeholder="Enter a password"
      />
      <input
        class="input-field registration-field"
        type="password"
        name="passwordConfirmation"
        placeholder="Confirm your password"
      />
      <input
        class="button button-submit registration-field"
        type="submit"
        value="Register"
      />
    </form>

所有的填充和边距都是相同的，所以我不知道发生了什么。知道问题是什么吗？

标签： htmlcssfrontend

Answer 1

您的文本字段两侧有额外的填充 (1em)。如果您希望它们正好是 350px 宽，您可以添加box-sizing: border-box到您的输入中。

变化：

.input-field {
  box-sizing: border-box;
}

片段：

:root {
    --main-color: #00308f;
    --secondary-color: #7cb9e8;
    --dark-color: #444;
    --light-color: #fafafa;
}

body {
    font-family: Montserrat,sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    text-align: justify;
    margin-top: 70px;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 0;
    padding: 1em;
}

.button {
    margin: 0 .5em;
    border-radius: .5em;
    padding: .5em 1.25em;
    font-weight: 700;
    min-width: 80px;
}

.button-submit {
    margin: 1.25em 0 0;
    padding: .6em 1.25em;
    width: 100%;
    background-image: linear-gradient(-45deg,var(--main-color),var(--secondary-color),var(--secondary-color),var(--secondary-color),var(--main-color));
    border: solid 1.5px var(--main-color);
    color: var(--main-color);
}

.button-submit:hover {
    background-image: linear-gradient(-45deg,var(--secondary-color),var(--main-color),var(--main-color),var(--main-color),var(--secondary-color));
    border: solid 1.5px var(--secondary-color);
    color: var(--light-color);
    transition-duration: .4s;
}

.input-field {
    margin: .5em 0;
    border: solid 1px var(--secondary-color);
    border-radius: .5em;
    padding: 0 1em;
    height: 35px;
    box-sizing: border-box;
}

.registration-field {
    width: 350px;
}

.registration-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

@media screen and (max-width:565px) {
    body {
        margin-top: 130px;
    }
}

<form class="registration-form">
      <h2>Create an account</h2>
      <input
        class="input-field registration-field"
        type="text"
        name="name"
        placeholder="Name"
      />
      <input
        class="input-field registration-field"
        type="email"
        name="email"
        placeholder="Email"
      />
      <input
        class="input-field registration-field"
        type="password"
        name="password"
        placeholder="Enter a password"
      />
      <input
        class="input-field registration-field"
        type="password"
        name="passwordConfirmation"
        placeholder="Confirm your password"
      />
      <input
        class="button button-submit registration-field"
        type="submit"
        value="Register"
      />
    </form>