DIV背景颜色在框内左右滑动，框外的隐藏，当颜色移入框内是显示

Question

**HTML**

<div class="box">
    <div>2位学号姓名</div>
    <div>2位学号姓名</div>
    <div>2位学号姓名</div>
</div>
<div class="box1"></div>

**CSS**

*{
        margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.5s ease-out;
}
.box{
    width: 1580px;
    height: 210px;
    margin: auto;
    margin-top: 50px;
}
.box div:nth-child(1){
    background-color: red;
}
.box div:nth-child(2){
    background-color: dodgerblue;
}
.box div:nth-child(3){
    background-color: green;
}
@keyframes circleRoate{
    0%{
        transform: translateX(0%);
        -webkit-transform: translateX(0%);
    }
    50%{
        transform: translateX(610px);
        -webkit-transform: translateX(610px);
    }
    100%{
        transform: translateX(0%);
        -webkit-transform: translateX(0%);
    }
}
.box div{
    width: 300px;
    height: 200px;
    font-size: 30px;
    float: left;
    text-align: center;
    color: white;
    line-height: 200px;
    animation: circleRoate 5s infinite linear;
    -webkit-animation: circleRoate 5s infinite linear;
}
.box1{
    width: 310px;
    height: 210px;
    margin: auto;
    position: fixed;
    top: 6%;
    left: 38%;
    border: 6px solid darkgray;
}

Answer 1

把box放在box1里面，box1再加个overflow:hidden