Colocando os botões de +Follow no tumblr com opacidade.

Cole esse código no seu CSS , entre <style> e </style>

iframe#tumblr_controls { right:3px !important; position: fixed !important; -webkit-transition: opacity 0.5s linear; opacity: 0.6; -webkit-transition: all 0.8s ease-out; -moz-transition: all 0.8s ease-out; transition: all 0.8s ease-out;} 

iframe#tumblr_controls:hover{ -webkit-transition: opacity 0.7s linear; opacity: 1; -webkit-transition: all 0.4s ease-out; -moz-transition: all 0.4s ease-out; transition: all 0.4s ease-out;}

e veja o resultado, se gostou salve.