【发布时间】：2021-07-01 05:50:34
【问题描述】：
这是我正在开发的网站，我正在尝试开发一个计算器，根据您尝试使用的主题和方程式，计算器会给您答案。
我制作了两个下拉菜单，但是，当我将鼠标悬停在“物理”菜单上时，由于某种原因，“数学”菜单被覆盖了。另外，“物理”的列表有点太长了，我想做一个滚动条，但不知道怎么做。
我尝试查看 w3schools 和其他资源，但找不到解决我问题的解决方案。
.redirect:hover{background-color:#aac8ff;}
div{background-color:#ccd9fb;}
h1{font-size: 20px; padding-left:10px;}
.dropdown-content a{background-color:#aac8ff}
.container:hover .dropdown-content{display:block}
.dropdown-content a:hover {background-color: #99b7ff;}
li.container{display:inline}
li{display:inline;}
body {
background-color: #eefbfb;
font-family: 'Inconsolata', monospace;
}
.top h1, .top ul{
display: inline-block;
vertical-align:top;
}
.redirect{
text-decoration:none;
font-size:20px;
display:block;
float: right;
color: #fff;
width:125px;
text-align:center;
border-left:1px solid #eefbfb;
padding: 14px;
}
ul{
list-style-type: none;
margin: 0;
padding: 0;
float:right;
}
.dropdown-content{
display:none;
z-index:1;
min-width:auto;
max-width:155px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
background-color:#99b7ff;
}
.dropdown-content a{
color:#fff;
display:block;
padding: 10px 13px;
text-decoration:none;
text-align: center;
}<body>
<div class="top">
<h1>123Calculator</h1></span>
<ul>
<li><a class="redirect" href="equations.html">Equations</a></li>
<li class="container">
<a class="redirect" href="physics.html">Physics</a>
<div class="dropdown-content">
<a href="Physics/1.PhotNEnLvl.html">Phontons and Energy levels</a>
<a href="Physics/2.Waves.html">Waves</a>
<a href="Physics/3.Mech.html">Mechanics</a>
<a href="Physics/4.Mat.html">Materials</a>
<a href="Physics/5.Elect.html">Electricity</a>
<a href="Physics/6.CircMot.html">Circular Motion</a>
<a href="Physics/7.SimpHarMot.html">Simple Harmonic Motion</a>
<a href="Physics/8.TherPhy.html">Thermal Physics</a>
<a href="Physics/9.GravFie.html">Gravitational Fields</a>
<a href="Physics/10.ElecFieNCap.html">Electric Fields and Capacitors</a>
<a href="Physics/11.MagFie.html">Magnetic Fields</a>
<a href="Physics/12.NukePhy.html">Nuclear Physics</a>
<a href="Physics/13.Astro.html">Astrophysics</a>
<a href="Physics/14.MedPhy.html">Medical Physics</a>
<a href="Physics/15.EngPhy.html">Engineering Physics</a>
<a href="Physics/16.TurnPInPhys.html">Turning Points in Physics</a>
<a href="Physics/17.Electronics.html">Electronics</a>
</div>
</li>
<li class="container">
<a class="redirect" href="maths.html">Maths</a>
<div class="dropdown-content">
<a href="Maths/1.AlgExpr.html">Algebraic Expressions</a>
<a href="Maths/2.EqNIn.html">Equations and Inequalities</a>
<a href="Maths/3.SkeCur.html">Sketching Curves</a>
<a href="Maths/4.ymaxc.html">Equations of Straight Lines</a>
<a href="Maths/5.circles.html">Circles</a>
<a href="Maths/6.trig.html">Trigonometry</a>
<a href="Maths/7.ExpNLog.html">Exponentials and Logarithms</a>
<a href="Maths/8.Diff.html">Differentiation</a>
<a href="Maths/9.Integ.html">Integration</a>
<a href="Maths/10.vect.html">Vectors</a>
<a href="Maths/11.proof.html">Proof</a>
<a href="Maths/12.kinem.html">Kinematics</a>
<a href="Maths/13.forces.html">Forces</a>
</div>
</li>
</ul>
</div>
</body>【问题讨论】：
标签： javascript html css hyperlink