input:-ms-input-placeholder {opacity: 0.4;}
input::-ms-input-placeholder {opacity: 0.4;}
input::-webkit-input-placeholder {opacity: 0.4;}
input:-moz-placeholder {opacity: 0.4;}
input::-moz-placeholder {opacity: 0.4;}

input:-ms-input-placeholder {transition: color 0.25s; font-weight: 400;}
input::-ms-input-placeholder {transition: color 0.25s; font-weight: 400;}
input::-webkit-input-placeholder {transition: color 0.25s; font-weight: 400;}
input:-moz-placeholder {transition: color 0.25s; font-weight: 400;}
input::-moz-placeholder {transition: color 0.25s; font-weight: 400;}

input:focus:-ms-input-placeholder {color: transparent !important;}
input:focus::-ms-input-placeholder {color: transparent !important;}
input:focus::-webkit-input-placeholder {color: transparent !important;}
input:focus:-moz-placeholder {color: transparent !important;}
input:focus::-moz-placeholder {color: transparent !important;}