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/* 初始化 */* {margin: 0;padding: 0;box-sizing: border-box;}/* 头部 *//* background-color:greenyellow; */header {background-color: greenyellow;padding: 0.5em 1em;display: flex;}/* logo */header .title {font-weight: lighter;font-style: italic;color: white;letter-spacing: 2px;text-shadow: 1px 1px 1px #555;}/* 登录按钮 */header button {margin-left: auto;width: 5em;border: none;border-radius: 0.5em;}header button:hover {cursor: pointer;background-color: coral;color: #fff;box-shadow: 0 0 2px 2px #fff;transition: 1s;}/* 模态框 */.modal .modal-form fieldset {height: 15.5em;background-color: rgb(131, 240, 116);border: none;padding: 2em 3em;box-shadow: 0 0 5px #888;}/* 模态框表单标题 */.modal .modal-form fieldset legend {padding: 7px 1.5em;background-color: greenyellow;color: white;}.modal .modal-form fieldset input {height: 3em;padding-left: 1em;outline: none;border: 1px solid #ddd;font-size: 14px;}/* :focus: 表单控件,获取焦点时的样式 */.modal .modal-form fieldset input:focus {box-shadow: 0 0 8px #888;border: none;}.modal .modal-form fieldset button {background-color: greenyellow;color: white;border: none;height: 3em;font-size: 16px;height: 2.5em;}.modal .modal-form fieldset button:hover {background-color: coral;cursor: pointer;}/* 定位 */.modal .modal-form {position: fixed;top: 10em;left: 35em;right: 38em;}/* 遮罩 */.modal .modal-bg {position: fixed;/* 坐标全部清0,请定位到四个顶点 */top: 0;left: 0;right: 0;bottom: 0;background-color: rgb(0, 0, 0, 0.5);}.modal {display: none;}
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