Example of Vue implementing fixed bottom component

<template>
  <div id="app">
    <div class="main">
      <img alt="Vue logo" src="./assets/logo.png">
      <HelloWorld msg="Welcome to Your Vue.js App"/>
      <img alt="Vue logo" src="./assets/logo.png">
    </div>
    <div class="footer">This is a button fixed at the bottom</div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components:
    HelloWorld
  }
}
</script>

<style>
:root{
  --footer-height: 50px;
}
body {
  padding: 0;
  margin: 0;
}
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
.main{
  padding-bottom: var(--footer-height);
  overflow-y: auto;
}
.footer{
  position: fixed;
  bottom: 0;
  width: 100%;
  line-height: var(--footer-height);
  background: #42b983;
  color: #fff;
}
</style>

<template>
  <div id="app">
    <div class="main">
      <img alt="Vue logo" src="./assets/logo.png">
      <HelloWorld msg="Welcome to Your Vue.js App"/>
      <img alt="Vue logo" src="./assets/logo.png">
    </div>
    <div class="footer" v-if='isShow'>
      <div class="footer-content">This is a button fixed at the bottom</div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components:
    HelloWorld
  },
  data() {
    return {
      isShow: true
    }
  },
}
</script>

<style>
:root{
  --footer-height: 50px;
}
body {
  padding: 0;
  margin: 0;
}
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
.main {
  overflow-y: auto;
}
.footer {
  height: var(--footer-height);
}
.footer-content {
  position: fixed;
  bottom: 0;
  width: 100%;
  line-height: var(--footer-height);
  background: #42b983;
  color: #fff;
}
</style>