.search-dropdown input {
  margin: 8px 15px;
  border: none;
  outline: none;
  width: 300px;
}

.search-dropdown input::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  font-size: 12px;
}
.search-dropdown input::-moz-placeholder { /* Firefox 19+ */
  font-size: 12px;
}
.search-dropdown input:-ms-input-placeholder { /* IE 10+ */
  font-size: 12px;

}
.search-dropdown input:-moz-placeholder { /* Firefox 18- */
  font-size: 12px;
}