body {
  background-color: #FFFFFF;
}


h1 {
  color: #000000;
  text-align: center;
  font-family: Trebuchet
  float: left;
  font-size: 50px;
 
}

p1 {
  font-family: verdana;
  font-size: 20px;
  color: #000000;

} 
p7 {
  font-family: Tahoma;
  font-size: 28px;
  color: #000000;

} 
<style>
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #218528;
  color: white;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}

* {
  box-sizing: border-box;
}



.column1 {
  float: left;
  width: 50%;
  padding-top: 21px;
  padding-right: 0px;
  padding-bottom: 10px;
  padding-left: 10px;
  background-color: #218528;
}
.column2 {
  float: left;
  width: 50%;
  padding-top: 1px;
  padding-right: 0px;
  padding-bottom: 10px;
  padding-left: 10px;
  background-color: #218528;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

.footer {
   position: fixed;
   left: 0;
   bottom: 0;
   width: 100%;
   background-color: #218528;
   color: white;
   text-align: center;
}

{box-sizing:border-box}


.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}


.mySlides {
  display: all;
}


.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}


.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}


.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}


.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}


.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}


.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}


.fade {
  animation-name: fade;
  animation-duration: 1.5s;
}

@keyframes fade {
  from {opacity: .4}
  to {opacity: 1}
}