CSS 全局样式冲突导致段落渲染异常：排查与解决方案

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  background: #30302F; /* problematic */
}

html,
body {
  font-family: 'Cinzel Decorative', cursive;
  text-align: center;
  background: #543DAF;
}

body {
  padding-bottom: 56px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

li,
a,
button {
  font-family: "Cinzel Decorative";
  font-weight: 500;
  font-size: 16px;
  color: #F4DA65;
  text-decoration: none;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 10%;
}

.logo {
  cursor: pointer;
  position: relative;
  right: 50px;
  margin-right: 50px;
}

.nav_links {
  list-style: none;
}

.nav_links li {
  display: inline-block;
  margin-right: 100px;
  padding: 0px 20px;
  right: 100px;
}

#Btn1 {
  border: none;
  padding: 10px 5px;
}

#Btn2 {
  border: none;
  padding: 10px 5px;
}

#Btn3 {
  border: none;
  padding: 10px 5px;
}

#Btn4 {
  border: none;
  padding: 10px 5px;
}

#Btn5 {
  padding: 9px 25px;
  background: rgba(84, 61, 175, 1);
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease 0s;
  margin-right: 50px;
  position: relative;
  left: 80px;
}

#Btn5:hover {
  background: rgba(84, 61, 175, 0.8);
}


/* Dropdown Button */

.dropbtn {
  font-size: 16px;
  border: none;
  position: relative;
}


/* The container <div> - needed to position the dropdown content */

.dropdown {
  position: relative;
  display: inline-block;
}


/* Dropdown Content (Hidden by Default) */

.dropdown-content {
  display: none;
  margin-right: 50px;
  position: absolute;
  background-color: #30302F min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}


/* Links inside the dropdown */

.dropdown-content a {
  color: #F4DA65;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}


/* Change color of dropdown links on hover */

.dropdown-content a:hover {
  background-color: rgba(84, 61, 175, 0.8);
  ;
}


/* Show the dropdown menu on hover */

.dropdown:hover .dropdown-content {
  display: block;
}

/* remove background-color on p */

.P1,
.P1 > p {
  background-color: transparent;
}

<header>
    <a href="https://athra.wiki"><img class="logo" src="athralogo.png" alt="Alogo" height="40px" width="80px"></a>
    <nav>
      <div class="dropdown">
        <a href="#"><button class="dropbtn" id="Btn1">Lore</button></a>
        <div class="dropdown-content">
          <a href="PrimordialEra.html">The Primordial Era</a>
          <a href="#">The Dawn Era</a>
          <a href="#">The Second Era</a>
        </div>
      </div>
      <div class="dropdown">
        <a href="#"><button class="dropbtn" id="Btn2">Info</button></a>
        <div class="dropdown-content">
          <a href="#">Characters</a>
          <a href="#">World</a>
          <a href="#">Magic</a>
          <a href="#">Races</a>
          <a href="#">Religion</a>
          <a href="#">Gods</a>
        </div>
      </div>
      <div class="dropdown">
        <a href="#"><button class="dropbtn" id="Btn3">Resources</button></a>
        <div class="dropdown-content">
          <a href="#">Beastiary</a>
          <a href="#">Maps</a>
          <a href="#">War System</a>
          <a href="#">Spells List </a>
        </div>
      </div>
    </nav>
    <a class="cta" href="#"><button id="Btn5" onclick="window.location.href='https://discord.gg/XtEDk7S8ax'">Roleplay Server</button></a>
  </header>

  <script src="script.js"></script>
  <div class="P1">
    <p>Welcome, fellow travellers! To Athra: Age of Kings</p>
  </div>