page{ background-color: #000; } .show-image{ width: 100vw; height: 100vw; margin-top: 40px; } .changeAvaBtn{ width: 112px; height: 28px; margin: 30px auto; background-color:rgba(255,255,255,0.3); border-radius: 25px; font-size: 14px; font-weight: 400; text-align: center; color: #ffffff; line-height: 28px; }