SOURCE

<div class="body">
<div class="nav">
    <input checked type="radio" name="tab" data-emo="☁" data-tab="多云" class="tab tab1">
    <input type="radio" name="tab" data-emo="☂""" data-tab="有雨"" class="tab tab2">
    <input type="radio" name="tab" data-emo="❉" data-tab="下雪" class="tab tab3"> 
    <input type="radio" name="tab" data-emo="☀" data-tab="晴天"" class="tab tab4">
    <div class="content-box">
        <div class="content content1">多云1</div>
        <div class="content content2">有雨2</div>
        <div class="content content3">下雪3</div>
        <div class="content content4">晴天4</div>
    </div>
    <div class="ball"></div>
</div>

</div>

:root{
    --color: skyblue;
}
.body{
    position: relative;
    width: 360px;
    height: 540px;
    margin: 0 auto;
    border: 1px solid sandybrown;
    background: var(--color)
}
.nav{
    display: flex;
    justify-content: center;
    position: absolute;
    top: 120px; 
    /* bottom: 0px; */
    width: 360px;
    height: 48px;
    padding: 4px 0 0px 0;
    background: white;
    border-radius: 4px;
}
.tab{
    position: relative;
    z-index: 2;
    top: -10px;
    width: 25%;
    margin: 0;
   
    appearance: none;
    text-align: center;
    overflow: hidden
}
.tab::before{
    /* 图标 */
    content: attr(data-emo);
    display: block;
    transition: all .5s;
    transform: translateY(20px);
    font-size: 16px;
}
.tab::after{
    /* 文字 */
    content: attr(data-tab);
    display: block;
    padding-bottom: 4px;
    transition: transform 1s, color .3s;
    transform: translateY(40px);
    color: whitesmoke;
}
.tab:checked::after{
    transition: transform .3s,color 1s;
    transform: translateY(8px);
    color: black;
    font-weight: 900;
}
.tab:checked::before{
    transform: translateY(-4px);
}
.ball{
    box-sizing: border-box;
    position: absolute;
    left: 0;
    top: -20px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(rgb(238, 128, 38), rgb(186, 248, 105));
    border: 4px solid var(--color);
    transition: all .3s;
}
.ball::before,
.ball::after{
    content: '';
    position: absolute;
    top: calc(50% - 1px);
    width: 20px;
    height:20px;
    background: white;
    box-shadow: 0 -10px 0 0 var(--color);
}
.ball::before{
    left: -23px;
    border-top-right-radius: 10px;
}
.ball::after{
    right: -23px;
    border-top-left-radius: 10px;
}
.tab:checked::before{
    color: white;
}
.tab1:checked~.ball{
    left: calc( 12.5% - 21px );
}
.tab2:checked~.ball{
    left: calc( 37.5% - 21px );
}
.tab3:checked~.ball{
    left: calc( 62.5% - 21px );
}
.tab4:checked~.ball{
    left: calc( 87.5% - 21px );
}

.content-box{
    position: fixed;
    top: 0;
    height: 100px;
    width: 360px;
    padding: 20px;
    margin: 0 auto;

}
.content{
    display: none;
}
.tab1:checked~.content-box>.content1{
    display: block;
}
.tab2:checked~.content-box>.content2{
    display: block;
}
.tab3:checked~.content-box>.content3{
    display: block;
}
.tab4:checked~.content-box>.content4{
    display: block;
}