.h105{
    height: 0.6rem;
}
header{
    height: 0.6rem;
}
.btn-box{
     height: 0.6rem;
     background-size: auto .4rem;
}
.btn{
    margin: 0.1rem;
}
.search{
    margin: 0.15rem;
}
@media only screen and (max-width: 640px) {
.aboutc{
    padding: 15% 2%;
}
}
@media only screen and (max-width: 568px) {
.aboutc{
    padding: 7% 2%;
}
}
@media only screen and (max-width: 667px) {
.aboutc{
    padding: 15.5% 2%;
}
}