Arial with Oswald in action on pawsomebox.co.uk

Under the hood

.header-1 { font-family: Oswald, sans-serif; font-size: 36px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 39px; text-transform: uppercase; color: #000000; }
.header-2 { font-family: Oswald, sans-serif; font-size: 30px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 33px; text-transform: uppercase; color: #F3997B; }
.header-3 { font-family: Oswald, sans-serif; font-size: 30px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 33px; text-transform: uppercase; color: #FAA634; }
.header-4 { font-family: Oswald, sans-serif; font-size: 30px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 33px; text-transform: uppercase; color: #9185BE; }
.content-1 { font-family: Arial; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 22px; text-transform: none; color: #000000; }
.content-2 { font-family: Arial; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 22px; text-transform: none; color: #000000; }
.content-3 { font-family: Arial; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 22px; text-transform: none; color: #000000; }

Arial is available from Fonts.com and MyFonts.