how to center text in css

.class {
	text-align: center;
}    div.a {
  text-align: center;
}


    div.b {
  text-align: left;
}


    div.c {
  text-align: right;
}

div.c {
  text-align: 
    justify;
}  <switch>
    h1 {
    text-align: center;
}

p.date {
    text-align: right;
}

 
p.main {
    text-align: justify;
} 
</Switch># center text
.center {
  text-align: center;
  
border: 3px solid green;
} /* html */
<h1>Centering with CSS</h1>

<h3>Text-Align Method</h3>
<div class="blue-square-container">
  <div class="blue-square"></div>
</div>

<h3>Margin Auto Method</h3>
<div class="yellow-square"></div>

<h3>Absolute Positioning Method</h3>
<div class="green-square"></div>

/* css */
h1,
h3 {
  text-align: center;
}

.blue-square-container {
  text-align: center;
}

.blue-square {
  background-color: #0074D9;
  width: 100px;
  height: 100px;
  display: inline-block;
}