flex

.one a{
display: flex;
690px;
margin: auto;
justify-content: center;
align-items: center;
}
.one span{
display: inline-block;
font-size:28px;
color:#212121;
line-height:90px;
}
.one .choose{
float: right;
line-height:90px;
color: #999999;
font-size: 28px;
margin-left: auto;
margin-right: 20px;
}

.one a{
display: block;
690px;
margin: auto;
}
.one span{
display: inline-block;
font-size:28px;
color:#212121;
line-height:90px;
}
.one .choose{
float: right;
line-height:90px;
color: #999999;
font-size: 28px;
}