無法在div中垂直居中文本

我只是無法將此文本垂直居中放置在我的 div（紅色背景）中，我已經嘗試了所有方法但沒有任何效果，請幫忙！出于某種原因，如果不使用邊距/填充，我什至無法在 div 中獲取我的文本。我試過對文本使用 div、span、p 和 h1，但沒有任何效果 =(

這是我的代碼：

        <div class="headerdiv">
            <div class="backtotop">
                <a class="material-symbols-outlined" href="#" >arrow_upward</a>
                <a class="backtotoptext" href="#">Voltar ao topo</a>
              </div>
        <div class="githubcontainer">
            <a href="https://github.com/maruan-achkar/javascript_exercicios" target="_blank" class="githublink" >//GITHUB LINK</a>
        </div>
        <div class="dropdown">
            <div class="dropdown-title-container">
            <p class="dropdown-title">MENU</p>
            </div>
            <div class="dropdown-content">
              <a class="dropdowna" href="#trocarvariaveis">// Trocar Variaveis<br></a>
              <a class="dropdowna" href="#celsiusparafarenheit">// Celsius para Farenheit<br></a>
              <a class="dropdowna" href="#farenheitparacelsius">// Farenheit para Celsius<br></a>
              <a class="dropdowna" href="#areacirculo">// Area Circulo<br></a>
              <a class="dropdowna" href="#parouimpar">// Par ou Impar<br></a>
              <a class="dropdowna" href="#intervalo">// Intervalo entre numeros<br></a>
              <a class="dropdowna" href="#intervalovetor">// Intervalo entre maior e menor de vetor<br></a>
              <a class="dropdowna" href="#maiormenor">// Maior e menor numero<br></a>
              <a class="dropdowna" href="#paisagemouretrato">// Paisagem ou retrato<br></a>  
              <a class="dropdowna" href="#fizzbuzz">// Fizz ou Buzz<br></a>
              <a class="dropdowna" href="#stringobject">// String do objeto<br></a>
              <a class="dropdowna" href="#parimparlimite">// Par ou impar ate limite<br></a>
            </div>
          </div>
        </div>
    </header>

--------------------------------------------CSS--------------------------------------------

.dropdown {
    float: left;
    background-color: #F6F7EB;
    height: 100%;
    width: 100px;
  }
  .dropdown-title-container{
    background-color: #DC3318;
    height: 100%;
    display: flex;
    justify-content: center;
  }
  .dropdown-title{
    font-family: Arial;
    font-weight: bolder;
    font-size: 1.75em;
    line-height: 100%;
  }
  .dropdown-content {
    display: none;
    position: absolute;
    top: 48px;
    background-color: #F6F7EB;
    padding-right: 15px;
    outline: solid black 3px;
    box-shadow: 0px 10px 15px black;
    border-radius: 0.1vw;
    font-size: 0.8em;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }
  .dropdowna{
    color: black;
    font-size: 1.75em;
    margin-left: 2vw;
    text-decoration: none;
  }```.sticky{
    position: fixed;
    top: 0;
    width: 100%;
    height: 45px;
    background-color: #DC3318;
    box-shadow: 0px 0px 5px rgb(0, 0, 0, 0.65);
}
.headerdiv{
    background-color: greenyellow;
    height: 100%;
    width: 100%;
}
.backtotop{
    font-weight: bolder;
    font-size: 0.75em;
    margin-right: 0;
    height: 100%;
    width: 160px;
    float: right;
    display: flex;
    align-items: center;
}
.backtotoptext{
    margin: auto;
    text-decoration: none;
    color: black;
    font-size: 1.55em;
    margin-right: 12px;
}
.material-symbols-outlined{
    text-decoration: none;
    margin-right: -30px;
    margin-bottom: 3px;
    color: black;
}
.backtotop:hover .backtotoptext{
    color: rgb(0, 132, 255);
}
.backtotop:hover .material-symbols-outlined{
    color: rgb(0, 132, 255);
}
.githubcontainer{
    width: 200px;
    height: 100%;
    float: right;
    margin-right: 40px;
    display: flex;
    align-items: center;
}
.githublink{
    color: black;
    margin: auto;
    font-size: 1.35em;
    text-decoration: none;
}
.githublink:hover{
    text-decoration: underline;
}

uj5u.com熱心網友回復：

只需添加 align-items:center;到.dropdown-title-container，文本就會垂直對齊。

uj5u.com熱心網友回復：

我測驗了你的代碼。但是，它不會顯示與您發布的圖片相同的螢屏，

所以我不能確切地說。你試過'align-items: center;'

.dropdown-title-container{
    background-color: #DC3318;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }

uj5u.com熱心網友回復：

我相信你正在嘗試做一些簡單的事情，但比需要的要難得多。

在您的 CSS 檔案中嘗試align-items: center在.dropdown-title-container.

像這樣：

.dropdown {
  float: left;
  background-color: #F6F7EB;
  height: 100%;
  width: 100px;
}
.dropdown-title-container{
  background-color: #DC3318;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.dropdown-title{
  font-family: Arial;
  font-weight: bolder;
  font-size: 1.75em;
  line-height: 100%;
}
.dropdown-content {
  display: none;
  position: absolute;
  top: 48px;
  background-color: #F6F7EB;
  padding-right: 15px;
  outline: solid black 3px;
  box-shadow: 0px 10px 15px black;
  border-radius: 0.1vw;
  font-size: 0.8em;
}

.dropdown:hover .dropdown-content {
  display: block;
}
.dropdowna{
  color: black;
  font-size: 1.75em;
  margin-left: 2vw;
    text-decoration: none;
  }
.sticky{
  position: fixed;
  top: 0;
  width: 100%;
  height: 45px;
  background-color: #DC3318;
  box-shadow: 0px 0px 5px rgb(0, 0, 0, 0.65);
}
.headerdiv{
    background-color: greenyellow;
    height: 100%;
    width: 100%;
}
.backtotop{
    font-weight: bolder;
    font-size: 0.75em;
    margin-right: 0;
    height: 100%;
    width: 160px;
    float: right;
    display: flex;
    align-items: center;
}
.backtotoptext{
    margin: auto;
    text-decoration: none;
    color: black;
    font-size: 1.55em;
    margin-right: 12px;
}
.material-symbols-outlined{
    text-decoration: none;
    margin-right: -30px;
    margin-bottom: 3px;
    color: black;
}
.backtotop:hover .backtotoptext{
    color: rgb(0, 132, 255);
}
.backtotop:hover .material-symbols-outlined{
    color: rgb(0, 132, 255);
}
.githubcontainer{
    width: 200px;
    height: 100%;
    float: right;
    margin-right: 40px;
    display: flex;
    align-items: center;
}
.githublink{
    color: black;
    margin: auto;
    font-size: 1.35em;
    text-decoration: none;
}
.githublink:hover{
    text-decoration: underline;
}

<header class="site-header">
    <div class="headerdiv">
      <div class="backtotop">
        <a class="material-symbols-outlined" href="#">arrow_upward</a>
        <a class="backtotoptext" href="#">Voltar ao topo</a>
      </div>
      <div class="githubcontainer">
        <a
          href="https://github.com/maruan-achkar/javascript_exercicios"
          target="_blank"
          class="githublink"
          >//GITHUB LINK</a
        >
      </div>
      <div class="dropdown">
        <div class="dropdown-title-container">
          <p class="dropdown-title">MENU</p>
        </div>
        <div class="dropdown-content">
          <a class="dropdowna" href="#trocarvariaveis"
            >// Trocar Variaveis<br
          /></a>
          <a class="dropdowna" href="#celsiusparafarenheit"
            >// Celsius para Farenheit<br
          /></a>
          <a class="dropdowna" href="#farenheitparacelsius"
            >// Farenheit para Celsius<br
          /></a>
          <a class="dropdowna" href="#areacirculo">// Area Circulo<br /></a>
          <a class="dropdowna" href="#parouimpar">// Par ou Impar<br /></a>
          <a class="dropdowna" href="#intervalo"
            >// Intervalo entre numeros<br
          /></a>
          <a class="dropdowna" href="#intervalovetor"
            >// Intervalo entre maior e menor de vetor<br
          /></a>
          <a class="dropdowna" href="#maiormenor"
            >// Maior e menor numero<br
          /></a>
          <a class="dropdowna" href="#paisagemouretrato"
            >// Paisagem ou retrato<br
          /></a>
          <a class="dropdowna" href="#fizzbuzz">// Fizz ou Buzz<br /></a>
          <a class="dropdowna" href="#stringobject"
            >// String do objeto<br
          /></a>
          <a class="dropdowna" href="#parimparlimite"
            >// Par ou impar ate limite<br
          /></a>
        </div>
      </div>
    </div>
  </header>

:D

此鏈接將來應該對您有所幫助。

標籤：网页格式CSS

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