如何解决我应该移动哪个CSS属性来快退按钮
我有一个带有时间元素和按钮的表格。我想将按钮移至底部，但不移至底部的最大值。我应该修改哪个CSS属性？
<!doctype html>
<html lang="fr">
<head>
<Meta charset="utf-8">
<Meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
<Meta name="description" content="">
<Meta name="author" content="Title">
<link rel="icon" href="ressources/favicon.ico" />
<title>Title</title>
<!-- Bootstrap core CSS -->
<link rel="stylesheet" href="ressources/style.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" href="https://getbootstrap.com/docs/4.0/examples/sign-in/signin.css" integrity="sha384-mKB41Eu6sQQvXR8fqvXcVe8SXodkH6cYtVvHkvLwE7Nq0R/+coO4yJispNYKy9iZ" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-light bg-light text-primary w-100 justify-content-center">
<div class="row">
<div class="col-12">
<a class="navbar-brand">
TEXT
</a>
</div>
</div>
</nav>
<center><b><label for="heure">This is a label</label></b></center>
<center><form method="post" action="myaction.PHP" role="form" id="formulaire" style="padding: 70px;">
<input type="time" id="heure" name="heure">
<button class="btn btn-primary" id="valider" name="valider" type="submit" style="position:absolute;bottom:0;left:40%;"></button>
</form></center>
</body>
</html>解决方法
根据您所做的操作，我将在CSS中将css更清楚地应用于按钮并调整中心：
#valider{
position:absolute;
bottom: 10%;
left: 50%;
transform: translate(-50%);
}<!doctype html>
<html lang="fr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="Title">
<link rel="icon" href="ressources/favicon.ico" />
<title>Title</title>
<!-- Bootstrap core CSS -->
<link rel="stylesheet" href="ressources/style.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" href="https://getbootstrap.com/docs/4.0/examples/sign-in/signin.css" integrity="sha384-mKB41Eu6sQQvXR8fqvXcVe8SXodkH6cYtVvHkvLwE7Nq0R/+coO4yJispNYKy9iZ" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-light bg-light text-primary w-100 justify-content-center">
<div class="row">
<div class="col-12">
<a class="navbar-brand">
TEXT
</a>
</div>
</div>
</nav>
<center><b><label for="heure">This is a label</label></b></center>
<center><form method="post" action="myaction.php" role="form" id="formulaire" style="padding: 70px;">
<input type="time" id="heure" name="heure">
<button class="btn btn-primary" id="valider" name="valider" type="submit" style=""></button>
</form></center>
</body>
</html>
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